Shapechanger. The gloomwyrm can use its action to curl up and assume itself into a beast form that resembles any crustacean (20 ft., swim 20 ft., +1 AC), or back into its shell-covered dragon form. Its statistics are the same in each form, except for the speed and armor changes noted. Any equipment it is wearing or carrying isn't transformed. It reverts to its true form if it dies. The gloomwyrm looks like an ordinary nonmagical beast while in crustacean form
Magic Resistance. The gloomwyrm has advantage on saving throws against spells and other magical effects.
Limited Respiratory Capacity. The gloomwyrm can hold its breath for up to 30 minutes at a time..
Bite (Pincers in Crustacean Form). Melee Weapon Attack: +3 to hit, reach 5 ft., one target. Hit: 4 (1d4 + 2) piercing damage, and the target must succeed on a DC 10 Constitution saving throw or take 4 (1d6) necrotic damage and have it's speed reduced by 5 feet until the end of the gloomwyrm's next turn.
Burden of Shadows(2/Day). One creature of the gloomwyrm's choice within 20 feet of it must succeed on a DC 12 Charisma saving throw, as the gloomwyrm exhales a targeted vapor dart. On a failed save, the target takes (1d4) necrotic damage, has disadvantage on saving throws until the start of the gloomwyrm's next turn, and it can't regain hit points until the start of the gloomwyrm's next turn.
Invisibility. The gloomwyrm magically turns invisible until it attacks or uses Burden of Shadows, or until its concentration ends (as if concentrating on a spell). Any equipment the gloomwyrm wears or carries is invisible with it.
Crustaceous Interception (3/Day). When a creature the gloomwyrm can see hits a target, other than itself, within 5 feet of it with an attack, the gloomwyrm can use its reaction to reduce the damage the target takes by 1d8 . The gloomwyrm must not be restrained or otherwise prevented from intercepting the damage with its crustaceous carapace.
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