Gargantuan Monstrosity, Unaligned
Armor Class 22 natural armor
Hit Points 231 (22d10 + 110)
Speed 60 ft.
STR
21 (+5)
DEX
25 (+7)
CON
20 (+5)
INT
15 (+2)
WIS
20 (+5)
CHA
14 (+2)
Saving Throws STR +11, WIS +11, CHA +8
Skills Acrobatics +13, Athletics +11, Intimidation +8, Perception +11
Damage Resistances Bludgeoning, Piercing, Slashing
Condition Immunities Grappled, Prone, Restrained, Stunned
Senses Passive Perception 21
Languages none
Challenge 18 (20,000 XP)
Proficiency Bonus +6
Traits

Legendary Resistance (3/Day). If the chasmfiend fails a saving throw, it can choose to succeed instead.

Siege Monster. The chasmfiend deals double damage to objects and structures.

Actions

Multiattack. The chasmfiend makes four attacks: one with its bite and three with its claws.

Bite. Melee Weapon Attack: +11 to hit, reach 5 ft., one target. Hit: 21 (3d10 + 5) piercing damage and the target becomes wounded for 1 minute. A wounded target takes 1d8 piercing damage at the start of its turns or until they recover at least 1 hit point.

Claws. Melee Weapon Attack: +11 to hit, reach 10 ft., one target. Hit: 19 (3d8 + 5) slashing damage and the chasmfiend can either deal an extra 1d8 bludgeoning damage or knock the target prone.

Trumpet (Recharge 5-6). The chasmfiend unleashes a trumpeting roar. Each creature within 30 feet who can hear the chasmfiend must make a DC 15 Wisdom saving throw. On a success, a character is Deafened until the end of the chasmfiend's next turn. On a failure, a character is Stunned and Deafened until the end of the chasmfiend's next turn. Chasmfiends are unaffected by this action.

Legendary Actions

The chasmfiend can take 3 legendary actions, choosing from the options below. Only one legendary action option can be used at a time and only at the end of another creature's turn. The chasmfiend regains spent legendary actions at the start of its turn.

Detect. The chasmfiend makes a Wisdom (Perception) check.

Move. The chasmfiend moves up to its speed.

Attack. The chasmfiend uses either its Bite or its Claws attack.

Description

Chasmfiends are the largest known land animals on Roshar. These massive crustaceans, called "beasts of the chasms" by the listeners, have a sprawling width of twenty feet, a height between thirty-six and thirty-nine feet, and a length easily over seventy feet. Their unique anatomy makes them well suited for life in their native Shattered Plains; with a long, narrow body, eighteen skittering legs, and armored carapace, a chasmfiend can navigate the chasms with ease and weather the highstorms above. Their thick eyelids close sideways over their green eyes, their four nostrils are small, and their small ear holes are set slightly behind their eyes.

These ruthless hunters can batter and carve their unlucky prey with their foreclaws, but their gaping maws are perhaps even more horrifying. With two smaller foreclaws, they snatch up food and push it into their jaw, where sharp fangs and thin mandibles navigate food to the inner rings of teeth and the final circular mouth. Chasmfiends are the apex predators of the Plains, hunting any animal found in the chasms between the plateaus. Many regard them to be the deadliest predators on Roshar.

The enormous emerald gemheart growing inside each chasmfiend allows them to bond with mandras-spren related to gravity. This bond allows the chasmfiends to reach a colossal size while preventing them from being crushed by their own weight.

Chasmfiends establish a nest in a chasm, hunting and scavenging from it until they ascend a plateau to pupate. However, in this state, the hunter becomes the hunted. While pupating, a chasmfiend can't protect themself; the chrysalis that forms around them isn't enough to protect them from people who seek gemhearts, and extracting the gemheart kills the chasmfiend.

 

Note: I converted the chasmfiend from the Cosmere RPG system. The original chasmfiend can be found in the Stormlight World Guide by Brotherwise Games and Dragonsteel Entertainment. All content comes from them.

Habitat: HillUnderdark

BaneofDwayne

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