Callisto is an enormous bear that resides south of the Demonic Ruins, and is the only monster to drop the tyrannical ring. He attacks using melee. He can knock players back a few tiles, which renders them unable to move for a few seconds, as well as heal himself slightly. He is also able to perform a deadly shockwave attack that can hit up to 60.
Item Quantity Rarity GE market price Big bones 1 Always 247
Item Quantity Rarity GE market price Rune pickaxe 1 Common 18,738 Rune 2h sword 1 Uncommon 37,760 Dragon pickaxe 1 Rare (1/171) 5,189,503 Dragon 2h sword 1 Rare (1/256) 133,056 Tyrannical ring 1 Rare (1/512) 1,787,650
Item Quantity Rarity GE market price Soul rune 250 Uncommon 36,250 Death rune 300 Uncommon 72,900 Chaos rune 400 Uncommon 34,800 Blood rune 200 Uncommon 78,200
Item Quantity Rarity GE market price Uncut ruby 20 (noted) Uncommon  26,240 Uncut diamond 10 (noted) Uncommon  27,330 Coconut 60 (noted) Uncommon 111,780 Crushed nest 75 (noted) Uncommon 354,675 Magic logs 100 (noted) Uncommon 101,500 Limpwurt root 25 (noted) Uncommon 22,975 Red dragonhide 75 (noted) Uncommon 183,900 Mahogany logs 400 (noted) Uncommon 200,400 Uncut dragonstone 1 Rare (1/128) 13,862 Grimy toadflax 100 (noted) Rare (1/128) 185,400
Item Quantity Rarity GE market price Snapdragon seed 3 Uncommon 257,346 Ranarr seed 5 Uncommon 355,270 Yew seed 1 Rare (1/128) 73,956 Magic seed 1 Rare (1/128) 114,030 Palm tree seed 1 Rare (1/128) 38,457
Item Quantity Rarity GE market price Dark crab 8 Common  12,528 Super restore(4) 3 Common  43,014
Item Quantity Rarity GE market price Coins 12,000–20,000 Common Not sold Supercompost 100 (noted) Uncommon 49,000 Cannonball 250 Uncommon 48,000 Mysterious emblem 1 Uncommon (1/27.5) 68,122 Looting bag 1 Uncommon (1/30) Not sold Slayer's enchantment 1 Uncommon (1/30) 2,251 Clue scroll (elite) 1 Rare (1/100) Not sold Dark fishing bait 375 Rare (1/128) 1,500 Long bone 1 Rare (1/400) Not sold Callisto cub 1 Very rare (1/2,000) Not sold Curved bone 1 Very rare (1/5,000) Not sold
- ↑ Only dropped while on a slayer assignment given by Krystilia, unless the kill was done on the official Bounty Hunter world. Killing Callisto on the Bounty Hunter also increases the drop rate from 1/27.5 to 1/5.
- ↑ Only dropped while on a slayer assignment given by Krystilia.
- ↑ 1/50 if a Ring of wealth (i) is worn.
- Callisto is named after one of the Greek god Zeus' many lovers, who was turned into the constellation Ursa Major.
- Upon release, Callisto had a slightly worse drop table. In addition, players could exploit his low Magic by safespotting him with the trident of the seas behind a cluster of skeletons north of him. The cluster of skeletons have been removed and Callisto is now immune to Magic damage.
- Callisto is the name of one of Jupiter's moons.
- His examine text is a reference to Goldilocks and the Three Bears.
- There is a pile of bear droppings in the woods south of his spawn, with the examine text "Now you know." — a reference to the popular colloquialism, "Does a bear shit in the woods?", a rhetorical question in response to something where the answer is obviously yes.
Wilderness bosses and rewards