Boss

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A boss is a powerful, usually unique monster that is fought to accomplish an objective. Some monsters that are commonly referred to as bosses are very powerful monsters that reside in multi-combat areas; these monsters are commonly fought by teams of players in search of highly valuable drops. Many bosses have extremely high combat levels, and most of the strongest monsters in the game are bosses.

Each boss has its own hiscore table, tracking the players with the most kills, or raid completions in the case of raid bosses. Each of these bosses has unique drops in the collection log. Most bosses will generate a message upon kill telling the player what drop(s) they have obtained. For example, if players are at Callisto and kill him (and drops Voidwaker hilt), a message will appear in the game box saying "Player name received item: Voidwaker hilt".

List of bosses

Wilderness bosses

The following world bosses are specifically located within the Wilderness, where players may attack each other. The one exception is the King Black Dragon: his lair where the fight takes place is not located in the Wilderness, but it can only be accessed through Wilderness, and is thus still considered risky.

Boss	Level	Hitpoints	Attack style(s)	Location	Drops
Nex	1001	3400	Magic Melee (crush) Ranged	West of Annakarl 46 East of Mage Bank Royal Donator Zone	Nexling Torva full helm Torva platebody Torva platelegs Ancient blood ornament kit Ancient godsword Zaryte vambraces
Avatar	525	2500	Magic Melee (stab) Ranged	All over the Wilderness! It spawns every hour on :15 minute.	Lil' destructor Ultor ring Soulreaper axe Virtus robe top Virtus robe bottom Virtus mask
TzTok-Jad	702	250	Magic Melee (stab) Ranged	All over the Wilderness! (Multi ) It spawns every hour	Tzrek-jad Dexterous prayer scroll Demonic relic Fire cape
Skotizo	321	450	Melee (slash) Magic	All over the Wilderness! It spawns every hour	Skotos Arcane prayer scroll Dark claw Demonic relic Dragonfire ward Ancient wyvern shield
Guardian of Votes	525	2500	Magic Ranged	All over the Wilderness! It will spawn every 1,000 votes and anyone that has voted in the past 24 hours can attack it!	Guardian of Votes Tokhaar-kal Ferocious gloves Avernic defender Divine rune pouch
Vet'ion	454	255	Melee (slash) Magic	Skeletal Tomb (::Vetsingle) Vet'ion's Rest (::Vetmulti) Royal Donator Zone	Vet'ion jr. Voidwaker blade Demonic relic Skull of vet'ion
Venenatis	464	850	Melee (stab) Magic Ranged	Web Chasm (::Vensingle) Silk Chasm (::Venmulti) Royal Donator Zone Donator Zone	Venenatis spiderling Voidwaker gem Demonic relic Fangs of venenatis
Callisto	470	1000	Melee (crush) Magic Ranged	Hunter's End (::Callistosingle) Callisto's Den (::Callistosingle) Royal Donator Zone	Callisto cub Voidwaker hilt Demonic relic Claws of callisto
Demonic Gorilla	275	380	Melee (crush) Magic Ranged	North of 44s Obelisk (::44s) Donator Zone	Pet Demonic Gorilla Demonic relic Heavy ballista
Chaos Fanatic	202	225	Magic	South of ::44s	Pet chaos elemental Demonic relic Demonic effigy
Crazy archaeologist	204	225	Melee (crush) Ranged	::Crazyarch	Demonic relic Demonic effigy Demonic medallion
Scorpia	225	200	Melee (crush)	Scorpion Pit	Scorpia's offspring Demonic relic Demonic effigy
King Black Dragon	276	255	Melee (stab) Dragonfire (long-ranged)	King Black Dragon Lair	Prince black dragon Dragonfire shield Fire cape Fighter torso
Chaos Elemental	305	250	Magic Ranged Melee (crush)	West of the Rogues' Castle	Pet chaos elemental Demonic relic Demonic effigy Dragon warhammer

World bosses

World bosses spawn across Gielinor either out in the open or in their lairs. World bosses are defined as bosses which spawn naturally, on their own, and can be killed at any time, as opposed to instanced bosses which spawn only in private lairs based on the actions of the player to whom the instance belongs. Some world bosses may, however, be killed in private instances for a price. Some world bosses, namely the Barrows brothers and God Wars Dungeon generals, also have additional requirements and mechanics related to finding and killing them. In the case of the Barrows brothers, they do not drop loot directly, but their defeat instead contributes to a single reward.

Boss		Level	Hitpoints	Attack style(s)	Location	Collection log
Corporeal Beast		785	2000	Melee (crush) Magic	Corporeal Beast Lair	Pet dark core Elysian sigil Spectral sigil Arcane sigil Holy elixir Spirit shield
Barrows		98	100	Magic	::Barrows	Ahrim's hood Ahrim's robetop Ahrim's robeskirt Ahrim's staff Bolt rack

Instanced bosses

As opposed to world bosses, instanced bosses can only be killed by a single player in the boss's lair, without the aid or even presence of other players.

Boss		Level	Hitpoints	Attack style(s)	Location	Collection log
Zulrah		725	500	Melee (Typeless) Ranged Magic	::Zulrah	Pet snakeling Toxic blowpipe (empty) Magic fang Magma mutagen Tanzanite mutagen Serpentine helm (uncharged) Zulrah's scales
Kraken		291	255	Magic (Typeless)	::Kraken (Optionally instanced)	Pet kraken Kraken tentacle Trident of the seas (full)

Sporadic bosses

Sporadic bosses are those that cannot be fought whenever the player wishes. Instead, they require a special item of some sort to gain access to them, which is obtained by partaking in other more common activities. Naturally, these bosses will also be instanced given the nature of their sporadic logistic. Of this list, Obor and Bryophyta are notably the only free-to-play bosses outside of quests.