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 206
Item Quantity Rarity GE market price Rune pickaxe 1 Common 18,791 Rune 2h sword 1 Uncommon 37,938 Dragon pickaxe 1 Rare (1/171) 6,362,692 Dragon 2h sword 1 Rare (1/256) 133,646 Tyrannical ring 1 Rare (1/512) 1,267,937
Item Quantity Rarity GE market price Soul rune 250 Uncommon 36,750 Death rune 300 Uncommon 62,400 Chaos rune 400 Uncommon 33,200 Blood rune 200 Uncommon 67,200
Item Quantity Rarity GE market price Uncut ruby 20 (noted) Uncommon  29,040 Uncut diamond 10 (noted) Uncommon  30,890 Coconut 60 (noted) Uncommon 131,940 Crushed nest 75 (noted) Uncommon 273,975 Magic logs 100 (noted) Uncommon 98,800 Limpwurt root 25 (noted) Uncommon 19,900 Red dragonhide 75 (noted) Uncommon 182,100 Mahogany logs 400 (noted) Uncommon 153,200 Uncut dragonstone 1 Rare (1/128) 13,689 Grimy toadflax 100 (noted) Rare (1/128) 191,000
Item Quantity Rarity GE market price Snapdragon seed 3 Uncommon 189,846 Ranarr seed 5 Uncommon 240,710 Yew seed 1 Rare (1/128) 70,584 Magic seed 1 Rare (1/128) 150,186 Palm tree seed 1 Rare (1/128) 54,048
Item Quantity Rarity GE market price Dark crab 8 Common  9,416 Super restore(4) 3 Common  32,928
Item Quantity Rarity GE market price Coins 12,000–20,000 Common Not sold Supercompost 100 (noted) Uncommon 35,700 Cannonball 250 Uncommon 40,000 Mysterious emblem 1 Uncommon (1/27.5) 74,851 Looting bag 1 Uncommon (1/30) Not sold Slayer's enchantment 1 Uncommon (1/30) 1,092 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