Magic Resistance. The Chasmfiend has an advantage on saving throws against spells and other magical effects.
Reflective Carapace. Any time the chasmfiend is targeted by a magic missile spell, a line spell, or a spell that requires a ranged attack roll, roll a d6. On a 1 to 3, the chasmfiend is unaffected. On a 4 or 5, the chasmfiend is affected for half of the damage. On a 6, the chasmfiend is unaffected, and the effect is reflected at the caster as though it originated from the chasmfiend, turning the caster into the target.
Siege Monster. The chasmfiend deals double damage to objects and structures.
Multiattack. The chasmfiend can use its Frightful Presence. It then makes four attacks: one with its bite, two with its claws, and one with its tail. It can use its Swallow instead of its bite.
Bite. Melee Weapon Attack: +19 to hit, reach 10 ft., one target. Hit: 36 (4d12 + 10) piercing damage. If the target is a creature, it is grappled (escape DC 20). Until this grapple ends, the target is restrained, and the tarrasque can't bite another target.
Claw. Melee Weapon Attack: +20 to hit, reach 15ft., one target. Hit: 28 (4d8 + 10) slashing damage. If the chasmfiend is fighting against a shardplate wearer if it hits, it damages the shardplate until the shard plate is either broken or the wearer is dead.
Tail. Melee Weapon Attack: +19 to hit, reach 20ft., one target. Hit: 24 (4d6 + 10) bludgeoning damage. If the target is a creature, it must succeed on a DC 20 Strength saving throw or be knocked prone.
Frightful Presence. Each creature of the chasmfiend's choice within 120 feet of it and aware of it must succeed on a DC 17 Wisdom saving throw or become frightened for 1 minute. A creature can repeat the saving throw at the end of each of its turns, with disadvantage if the chasmfiend is within line of sight, ending the effect on itself on a success. If a creature's saving throw is successful or the effect ends for it, the creature is immune to the chasmfiend's Frightful Presence for the next 24 hours.
Swallow. The chasmfiend makes one bite attack against a Large or smaller creature it is grappling. If the attack hits, the target takes the bite's damage, the target is swallowed, and the grapple ends. While swallowed, the creature is blinded and restrained, it has total cover against attacks and other effects outside the tarrasque, and it takes 56 (16d6) acid damage at the start of each of the chasmfiend's turns.
If the chasmfiend takes 30 damage or more on a single turn from a creature inside it, the chasmfiend must succeed on a DC 20 Constitution saving throw at the end of that turn or regurgitate all swallowed creatures, which fall prone in a space within 10 feet of the chasmfiend. If the chasmfiend dies, a swallowed creature is no longer restrained by it and can escape from the corpse by using 30 feet of movement, exiting prone.
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 tarrasque regains spent legendary actions at the start of its turn.
Attack. The chasmfiend makes one claw attack or tail attack.
Move. The chasmfiend moves up to half its speed.
Chomp (Costs 2 Actions). The tarrasque makes one bite attack or uses its Swallow.
Description
Chasmfiends are massive crustacean-like creatures that grow up to fifty feet tall. They are covered with a hard, protective exoskeleton of interlocking carapace the color of dark, violet ink. They have 14 trunk-like legs, 4 wicked, horse-sized foreclaws set into broad shoulders, a dozen smaller legs, and are capable of crushing a man in Shardplate. They are long and narrow like crayfish and have a flattened tail.
They have a twisted, arrowhead-like face, uniform green eyes, and a mouth full of barbed mandibles. The mandibles likely account for the beast's deep, overlapping, trumpeting voices.
When injured and blood is exposed, it is of violet color and smells like mold.
Every chasmfiend grows a gemstone inside, called a gemheart. Each gemstone is unusually large and extremely valuable, especially when compared to those of other known greatshells. The chasmfiend's life cycle is complex and, at some point within it, it seeks one of the wider plateaus, climbs up, and forms a pupa, waiting for the coming of a highstorm. During that time, they are very vulnerable.
The chrysalis within which the chasmfiend pupates is very like an enormous, oblong rockbud, fifteen feet tall and attached to the uneven stone of the Shattered Plains by something that looks like crem. Plunging a Shardblade into it would kill the pupating creature, but avoid the region with the valuable gemheart.
It is noted that hair, nails, and chitin can be cut by Shardblades, just like clothing. So this would infer that chrysalises are, just like in the real world, made of secretions (silk, for example) and not live tissue. They could be heavily related to the Parshendi, considering they both have blood smelling of mold, a gemheart, and chitinous armor.
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