TarrasqueGargantuan monstrosity (titan)
Legendary Resistance (3/day). If the tarrasque fails a saving throw, it can choose to succeed instead.
Magic Resistance. The tarrasque has advantage on saving throws against spells and other magical effects.
Reflective Carapace. Any time the tarrasque is targeted by a magic missiles spell, a cone or line spell, or a spell that requires a ranged attack roll, roll a d6. On a 1 to 5, the tarrasque is unaffected. On a 6, the tarrasque is unaffected, and the effect is reflected back at the caster as though it originated from the tarrasque, turning the caster into the target.
Siege Monster. The tarrasque deals double damage to objects and structures.
Bite (1/turn). Melee Weapon Attack: +19 to hit, reach 2 m. Hit: 36 (4d12 + 10) piercing damage. If the target is a creature, it is grappled (escape Difficulty 19). Until this grapple ends, the target is restrained, and the tarrasque can’t bite another target.
Claw (2/turn). Melee Weapon Attack: +19 to hit, reach 3 m. Hit: 28 (4d8 + 10) slashing damage.
Horns (1/turn). Melee Weapon Attack: +19 to hit, reach 2 m. Hit: 32 (4d10 + 10) piercing damage.
Tail (1/turn). Melee Weapon Attack: +19 to hit, reach 4 m., one target not grappled by the tarrasque. Hit: 24 (4d6 + 10) bludgeoning damage. If the target is a creature, it must succeed on a Difficulty 27 Reflex saving throw or be knocked prone.
Frightful Presence (1/turn). Each creature of the tarrasque’s choice within 20 meters of it and aware of it must succeed on a Difficulty 17 Will 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 tarrasque 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 tarrasque’s Frightful Presence for the next 24 hours.
Swallow (1/turn). The tarrasque 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 tarrasque’s turns.
If the tarrasque takes 60 damage or more on a single turn from a creature inside it, the tarrasque must succeed on a Difficulty 25 Fortitude saving throw at the end of that turn or regurgitate all swallowed creatures, which fall prone in a space within 2 meters of the tarrasque. If the tarrasque dies, a swallowed creature is no longer restrained by it and can escape from the corpse by using 5 meters of movement, exiting prone.
Legendary Actions (3)
Only one legendary 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 tarrasque makes one claw attack or tail attack.
Chomp. The tarrasque makes one bite attack or uses its Swallow.
Move. The tarrasque moves up to half its speed.
No concoctions, maneuvers, or spells
All creatures in this system should have maneuvers or spells. You should add some maneuvers or spells to this creature. If you do so, please make a suggestion on github so I can finish adding maneuvers and spells to all creatures via https://github.com/mlenser/kryx-rpg-issues/issues/9.