Glacial Bone Colossus

Local fishermen and arctic tribes tell of sleeping giants beneath the ice that awaken to claim trespassers. Sailors call them bone-titans and avoid coves where the sea boils thin with frost. Some say they are failed experiments of an ancient cold sorcerer who sought to make death itself a part of the glacier.

HP119AC16SPD30 ft., Swim 20 ft.CR7 (2,900 XP)AthleticsPerception
STR
20
save
DEX
8
CON
18
save
INT
6
WIS
12
CHA
10
Undying Frost. If damage reduces the colossus to 0 hit points, it must make a Constitution saving throw. On a success, it drops to 1 hit point instead. If it fails, it disintegrates into a heap of frost-bitten bones. Once this trait triggers, it cannot do so again until the next dawn.
Frost Aura. Any creature that ends its turn within 5 feet of the colossus takes cold damage as rime leaches heat.
Frozen Terrain Adept. While in arctic terrain (snow, glacier, sea ice), the colossus has advantage on Strength checks and saving throws and its walking pace increases by 10 feet.
Multiattack. The colossus makes two Slam attacks.
Slam. Melee Weapon Attack: to hit, reach 10 ft., one target. Hit: bludgeoning damage plus cold damage. If the target is a creature made of water or is wearing no heavy clothing, it takes an additional cold damage.
Glacial Stomp. The colossus stomps the ground. Each creature in a 15-foot radius centered on the colossus must succeed on a Constitution saving throw or take bludgeoning damage and cold damage and be knocked prone. On a successful save, a creature takes half as much damage and is not knocked prone. The ground in the area becomes icy difficult terrain until the end of the colossus's next turn.
Frost Breath. Recharge 5-6. The colossus exhales a frigid cone 30 feet long. Each creature in that area must make a Dexterity saving throw, taking cold damage on a failed save, or half as much damage on a successful one. Creatures that fail the save have their speed reduced by 10 feet until the end of the colossus's next turn as frost stiffens their limbs.
Icy Grasp. Melee Weapon Attack: to hit, reach 10 ft., one Large or smaller creature grappled by the colossus. Hit: bludgeoning damage plus cold damage, and the target is grappled (escape ). While grappled in this way, the target takes cold damage at the start of each of the colossus's turns. The colossus can grapple only one creature with this attack at a time.
Rime Shield. When the colossus is hit by an attack, it can cause a bloom of rime that reduces the damage by 10. It can use this reaction a number of times equal to 1 plus its Constitution modifier (minimum once). The colossus regains expended uses after finishing a short or long rest.
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