Great Olm

Great Olm
Released										2023
Donator										No
Combat level										1,043
Size										3x3
Examine										Ferocious. It's unnerving.
Combat info
Max hit										Varies
Aggressive										Yes
Poisonous										Yes
Attack style										Magic, Ranged
Attack speed										6 ticks (3.6 seconds)
Slayer info
Slayer level										1
Slayer XP										30,000 xp
Category										Chambers of Xeric
Assigned by
Combat stats
800					250					250					150					250					100
Aggressive stats
+0					+0					+0					+0					+0					+0
Defensive stats
+200						+200						+200						+200						+50
Advanced data
Monster ID										7554

The Great Olm (referred to as the Guardian in the Deep by Xeric's followers) is the final boss in the Chambers of Xeric raid. A large, blind, white salamander, it is one of Xeric's greatest possessions.

Slayer

Chambers of Xeric can only become a Slayer task through a Choose Wisely scroll (2–5 raids); Krystilia never assigns it at random. Only finished raids count, in normal or Challenge mode: when the raid is completed, every player in it who has the task gets one raid off it and 30,000 Slayer experience before the Slayer XP boosts. Slayer bracelets do not work on raid tasks. The task teleport takes you to the Chambers of Xeric.

Mechanics

Fighting the Great Olm's claw in its crystal chamber at the end of the Chambers of Xeric (::cox), with the Olm's head rising out of the wall

Attacks

• Standard attacks: Olm has two standard attacks: Magic and Ranged. The magic attacks are large green orbs, while the ranged attacks are smaller chunks of crystal. Both deal the same amount of damage. The correct protection prayer reduces the damage by 70%.
• Spheres: Olm randomly picks a sphere (red, green or purple) and sends it at the player. If not blocked, the player will be damaged approximately 50% of their current Hitpoints. If a protection prayer was used when the sphere was launched, it is disabled and the player's Prayer is reduced by 50%. To block the attack, pray accordingly before and as the sphere hits you:
  • Red (sphere of aggression): Protect from Melee
  • Green (sphere of accuracy and dexterity): Protect from Missiles
  • Purple (sphere of magical power): Protect from Magic

During phases 1-3, Olm also has access to these specific attacks:

• Crystal Burst: Olm throws a crystal seedling under every player in the chamber. A few seconds later, the crystals burst and shove the player to a nearby tile if they are on top of them for heavy damage. The left hand will briefly show a crystal icon when using this attack.
• Lightning: Shoots out lightning running north and/or south of the chamber. Getting hit by a bolt of lightning electrocutes the player, disabling their overhead prayers, dealing moderate damage, and binding them. The left hand will briefly show a lightning bolt when using this attack.
• Swap: Olm will perform a teleport attack that deals damage the further the player is from the target. The left hand briefly shows a swirl when using this attack. If alone, Olm will pick a random tile anywhere in the chamber; if there are more players in the room, Olm will evenly distribute the amount of teleports. If there is an odd-numbered amount of people inside, then those people will not be subjected to the attack.

Olm also has phase-unique attacks which can replace one of the auto-attacks in his rotation:

• Acid:
  • Acid Spray: Olm spits out several pools of acid around the chamber. Standing on top of an acid pool deals 3-6 damage per tick and inflicts poison starting at 2 damage.
  • Acid Drip: Olm covers a player in acid, causing them to generate acid pools under them. Standing still will deal damage and moving will generate more pools, though it is not much of a deal in small groups. The pools function the same way as the pools in the spray attack.

A group of players fighting the Great Olm.

• Flame:
  • Deep Burn: Olm shoots out a green fireball at a player, causing them to yell "Burn with me!". The targeted player takes 5 damage every few ticks, dropping stats by 2 each time this occurs for six hits. If it spreads to other players, the timer resets and newly infected players will initially yell "I will burn with you."
  • Fire Wall: Olm shoots out two walls of fire at a player to trap them. If the player is on a tile that would be occupied by the fire wall, they will leap out and take 8-10 damage in the process. After the walls are placed, players in the tiles between the two walls will take 50-65 damage in 5 seconds if they do not escape. Any water, such as water spells, ice spells, Humidify or a filled watering can will suffice in dousing a segment of flame.
• Crystal:
  • Falling Crystals: Olm lets out a cry, targeting one player with a red aura. 11 spiked crystals fall from above, dealing up to 15-20 damage to anyone in the targeted tile.
  • Crystal Bombs: Olm shoots out a crystal bomb (up to three at most; two for smaller groups). The bomb explodes after being deployed for several seconds, covering a radius of four tiles. The minimum amount of damage dealt is 15, increasing by an additional 15 damage for every tile closer to it.

There are also attacks applied during other segments of the fight:

• Autoheal: During the first three phases, any attacks aimed at the head are completely healed after several ticks have passed. In the third phase, the left arm also gets a variant of this ability where any attacks that deal damage will cause it to heal instead. When this is performed the left hand shows an infinity symbol.
• Falling Crystals: During phase transitions and the last phase, Olm causes chunks of crystal to fall from above. These crystals have a 3x3 AoE; getting directly hit (underneath the shadow) by them will deal 16-25 damage, while getting indirectly hit (one tile from centre) deals 10-16 damage. One crystal will always be aimed at a random player in the chamber. A shadow will indicate where the crystal will land.
• Life Siphon: In the last phase, Olm will shoot out two blue projectiles which generate a shield when it hits the ground. Several ticks later, Olm will damage anyone not on the targeted tiles for moderate damage, healing himself for five times the total amount of damage it deals to the team.

Fight overview

"Safespots" against Olm.

The mystical barrier which precedes the boss fight.

Olm has at least four phases, with an additional phase for every 8 players in the raid. Unlike the other bosses in the room, once the player enters his chamber, it is a fight to the death. In each phase except the penultimate and final ones, Olm will focus on a specific set of abilities referred to as powers.

On Roat Pkz, Olm's hitpoints go up by 50% and its other stats by 20% for every extra player in the raid, despite him having a pre-determined combat level. This applies to the head and both claws. In Challenge mode the head is stronger (1,600 hitpoints). If stat draining attacks — such as dragon warhammer special attack — are used, they only affect the part of him that was hit. His stats also reset when a new phase starts.

Olm attacks with ranged and magic, the former consisting of a chunk of crystal and latter green-coloured dragonfire. There is a 1/5 chance the Great Olm will switch between these attack styles each time its head performs an attack. Olm has three attack zones to choose from; left, middle and right. He prioritises the zone with the most amount of players. If no players are in that zone, he will swerve his head accordingly and skip an attack in its attack rotation. If a player is in his attack zone but Olm swerves his head regardless, no attacks are skipped.

Olm's attack rotation consists of the following below. Phase-specific attacks are incorporated into the attack pattern as an auto-attack and alternate between the available pool:

• 2 auto-attacks
• Crystal Burst
• 2 auto-attacks
• Lightning
• 2 auto-attacks
• Teleport
• Loops from above

There is a 1/3 the Great Olm will carry out a phase-specific attack in lieu of an auto-attack (provided they are not on cooldown), increasing to a 1/2 chance during the final phase of the encounter. When this roll succeeds, the Great Olm will consequently try to avoid picking any of the available phase-specific attacks it has already used before.

In order to progress to the next phase, both of Olm's hands must be disabled. The Olm's left hand will clench if it takes a particularly heavy hit, equal to at least 1/20 of its base health. Olm's head can be attacked at any phase, although he will automatically recover any damage taken shortly afterwards in all but the final phase. When both hands are disabled, Olm will retreat underground and shake the area with AoE falling crystals before reappearing on the other side with a new power. During the penultimate phase, the left hand gains a damage to health ability indicated with an infinity sign on it. In this phase, both of Olm's hands must be disabled within a specific time frame or it will recover back at full health. All powers are available to Olm during this phase, and it is indicated with Olm's head glowing.

Once both hands are disabled, Olm remains on the spot and attempts a final stand. AoE crystals will continually fall from above until Olm is killed. As with the previous phase, he has access to all of its powers.

Setups by price

These setups come from what players wear when they kill the Great Olm, the last boss of the Chambers of Xeric. Each tab shows the gear most players use at that price, what it costs, and how long a whole raid usually takes with it. Prices are in PK points (PKP) at today's in-game prices, and spawnable items are free to spawn. The raid potions in the inventories are handed out free inside the raid. Almost everyone fights the Great Olm with ranged.

SpawnableLow (under 100K)Mid (under 1M)Max

Slot	Item	PK points
Head	Helm of neitiznot	Spawnable
Cape	Ava's accumulator	Spawnable
Neck	Amulet of glory(6)	Spawnable
Ammo	Dragonstone bolts (e)	Spawnable
Weapon	Rune crossbow	Spawnable
Body	Black d'hide body	Spawnable
Shield	Rune kiteshield	Spawnable
Legs	Black d'hide chaps	Spawnable
Hands	Barrows gloves	Spawnable
Feet	Climbing boots	Spawnable
Ring	Ring of recoil	Spawnable
Supplies (inventory)		Free
Total		Free

Typical raid: too few raids in this gear to measure

• Everything here can be spawned for free.
• Carry an Abyssal whip melee switch and an Ancient staff magic switch for the rooms that need them.
• Only a handful of players raid in spawnable gear.

Slot	Item	PK points
Head	Helm of neitiznot	Spawnable
Cape	Ava's assembler	1,000
Neck	Necklace of anguish	15,000
Ammo	Diamond dragon bolts (e)	1
Weapon	Dragon hunter crossbow	32,500
Body	Armadyl chestplate	5,000
Shield	Dragon defender	1,000
Legs	Armadyl chainskirt	5,000
Hands	Barrows gloves	Spawnable
Feet	Primordial boots	2,500
Ring	Brimstone ring	400
Supplies (inventory)		57,705
Total		120,106

Typical raid: about 16 minutes

• The Dragon hunter crossbow is 30% more accurate against the Great Olm, which counts as a dragon.
• Most low-tier raiders carry a melee switch (Abyssal tentacle and Bandos armour, with a Bandos godsword for its special attack) and a magic switch (Trident of the swamp and Ahrim's robes).

Slot	Item	PK points
Head	Masori mask (f)	100,000
Cape	Ava's assembler	1,000
Neck	Necklace of anguish	15,000
Ammo	Diamond dragon bolts (e)	1
Weapon	Dragon hunter crossbow	32,500
Body	Masori body (f)	125,000
Shield	Twisted buckler	15,000
Legs	Masori chaps (f)	125,000
Hands	Barrows gloves	Spawnable
Feet	Avernic treads (max)	100,000
Ring	Lightbearer	15,000
Supplies (inventory)		443,005
Total		971,506

Typical raid: about 12 minutes

• Mid-tier players keep the Dragon hunter crossbow and add Masori (f) armour and a Twisted buckler.
• Mid-tier raiders carry a melee switch with a Dragon hunter lance and a Dragon warhammer for its special attack, and a magic switch in Ancestral robes. Many use a Sanguinesti staff (750,000 ) instead of the trident, which takes the setup over 1M.

Slot	Item	PK points
Head	Masori mask (f)	100,000
Cape	Dizana's max cape	2,099,000
Neck	Necklace of anguish (or)	25,000
Ammo	Dragon arrow(p++)	Spawnable
Weapon	Twisted bow	20,000,000
Body	Masori body (f)	125,000
Shield	None (two-handed weapon)
Legs	Masori chaps (f)	125,000
Hands	Zaryte vambraces	30,000
Feet	Avernic treads (max)	100,000
Ring	Venator ring	140,000
Supplies (inventory)		35,550,005
Total		58,294,005

Typical raid: about 7 minutes 15 seconds

• Max-tier players bring full melee and magic switches for the rooms that need them: a Scythe of vitur set and a Tumeken's shadow set.
• The switches are what make this tab expensive: the gear you wear at the Great Olm costs about 23M.

Equipment

Note: The equipment layouts below is for melee only, with magic and ranged switches in the player's inventory due to all three combat styles being required.

MeleeRangedMagic

Recommended equipment for Melee

Slot	Item (most effective → least effective)
	Torva full helm	Neitiznot faceguard	Inquisitor's great helm	Serpentine helm
	Amulet of torture	Amulet of blood fury	Amulet of fury	N/A
	Infernal cape	Fire cape	N/A	N/A
	Torva platebody	Bandos chestplate	Inquisitor's hauberk	Fighter torso
	Torva platelegs	Inquisitor's plateskirt	Bandos tassets	Blessed chaps
	Scythe of vitur	Dragon hunter lance	Abyssal tentacle/Ghrazi rapier	Osmumten's fang
	Avernic defender	Dragon defender	N/A	N/A
	See Ranged	N/A	N/A	N/A
	Ferocious gloves	Barrows gloves	N/A	N/A
	Primordial boots	Dragon boots	N/A	N/A
	Lightbearer	Ultor ring	Berserker ring (i)	Brimstone ring
	Bandos godsword	Dragon warhammer	Arclight	N/A

Recommended equipment for Ranged

Slot	Item (most effective → least effective)
	Masori mask (f)	Armadyl helmet	Void ranger helm	Any melee helmet
	Necklace of anguish	Amulet of fury	N/A	N/A
	Ava's assembler	Ava's accumulator	N/A	N/A
	Masori body (f)	Armadyl chestplate	Blessed body	Elite void top
	Masori chaps (f)	Armadyl chainskirt	Blessed chaps	Elite void robe
	Twisted bow	Dragon hunter crossbow	Zaryte crossbow	Armadyl crossbow
	Twisted buckler	Dragonfire ward	Odium ward	N/A
	Dragon arrows	Ruby dragon bolts (e)	Ruby bolts (e)	N/A
	Zaryte vambraces	Barrows gloves	Void knight gloves	N/A
	Pegasian boots	N/A	N/A	N/A
	See Melee	N/A	N/A	N/A
	Zaryte crossbow	N/A	N/A	N/A

Recommended equipment for Magic

Slot	Item (most effective → least effective)
	Ancestral hat	Any melee helmet	N/A	N/A
	Occult necklace	Amulet of fury	N/A	N/A
	Imbued god cape	N/A	N/A	N/A
	Ancestral robe top	Virtus robe top	Ahrim's robetop	N/A
	Ancestral robe bottom	Virtus robe bottom	Ahrim's robeskirt	N/A
	Tumeken's shadow	Sanguinesti staff	Trident of the swamp	Harmonised nightmare staff
	Tome of fire	Elidinis' ward (f)	Arcane spirit shield	N/A
	See Ranged	N/A	N/A	N/A
	Tormented bracelet	Barrows gloves	N/A	N/A
	Camp/Takeoff melee boots	N/A	N/A	N/A
	See Melee	N/A	N/A	N/A

Setups

Potions are free at the start of every raid.

Minimum	Medium	Max

Drops

Everyone who finishes the raid gets their own loot, and it depends on your points. You earn 7.5 points for every damage you deal to the Great Olm's head and claws, and dying loses 40% of your points. In a team the points are shared between you. Most solo raids end with about 34,000 points, and about 67,500 in Challenge Mode.

• 500 points or less: a cabbage.
• 501 to 3,000 points: 1 to 500 PK points.
• Over 3,000 points: one or two common drops, a roll for Vespula's venom, and a chance at a purple: one item from the Purples table. In Challenge Mode you can also get Metamorphic dust.

Every full 3,000 points gives you just over a 1% chance of a purple (1 in 99.1). Your donator rank, a My Chamber scroll, a Collector's ring and Challenge Mode multiply it. Enter your points and pick your boosts in the bar below, and every chance in this section changes to match.

Purples

Item	Amount	If you get a purple	Chance per raid
Any purple	–	–	11.1% 1/9
Twisted bow	1	1/108 0.93%	1/968 0.103%
Dexterous prayer scroll (Rigour)	1	1/323 0.31%	1/2,905 0.0344%
Arcane prayer scroll (Augury)	1	1/323 0.31%	1/2,905 0.0344%
Torn prayer scroll (Preserve)	1	1/65 1.55%	1/581 0.172%
Dragon hunter lance	1	1/26 3.88%	1/232 0.43%
Dragon claws	1	1/13 7.75%	1/116 0.86%
Dinh's bulwark	1	1/13 7.75%	1/116 0.86%
Elder maul	1	1/13 7.75%	1/116 0.86%
Kodai wand	1	1/13 7.75%	1/116 0.86%
Dragon hunter crossbow	1	1/13 7.75%	1/116 0.86%
Twisted buckler	1	1/13 7.75%	1/116 0.86%
Ancestral hat	1	1/13 7.75%	1/116 0.86%
Ancestral robe top	1	1/13 7.75%	1/116 0.86%
Ancestral robe bottom	1	1/13 7.75%	1/116 0.86%
Deadeye prayer scroll	1	1/13 7.75%	1/116 0.86%
Mystic vigour prayer scroll	1	1/13 7.75%	1/116 0.86%
Twisted ancestral colour kit	1	1/13 7.75%	1/116 0.86%
Olmlet (pet)	1	1/66 1.52%	1/595 0.168%
Vespula's venom	1	–	1/5,000 0.02%
Metamorphic dust	1	–	1/401 Challenge Mode only

Vespula's venom is rolled on its own, with or without a purple, and the same boosts improve it. Use it on a Twisted bow to make a Vespula's twisted bow.

Common drops

Every chest gets one of these, and a second one with a 100% chance: 1% for every 300 points, so it is certain from 30,000 points. Each one is rolled on its own, and a Double Time scroll rolls the chest twice.

Item	Amount	Chance each roll	Chance per raid
PK points	1–30,000	5/10	75% 1/1.3
Anglerfish (noted)	1–10,000	1/10	19% 1/5.3
Stamina potion(4) (noted)	1–3,000	1/10	19% 1/5.3
Divine super combat potion(4) (noted)	1–1,500	1/10	19% 1/5.3
Magic logs (noted)	1–300	1/10	19% 1/5.3
Runite bar (noted)	1–200	1/10	19% 1/5.3

Purple chance calculator

See your chances over many raids. Enter your points, set your rank and boosts, type how many raids you plan to do and pick the item you want. The answers change as you go.

The calculator needs JavaScript. A solo raid with about 34,000 points and no boosts has an 11.1% chance of a purple.

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