Playing way too many video games lately, but saw a fun spell that I think a character might want as a belt.
Belt of Shocking Grasp
Wondrous item, rare (requires attunement)
This simple dark leather belt is inlayed with tracery of silver. While wearing this belt, if you are grabbed or swallowed by a creature, that creature must immediately make a DC 17 Constitution saving throw. On a failure, the creature take 3d8 lightning damage and must end the grab. On a success, the creature takes half damage and does not need to end the grab. If the creature is unable to release you in the case you were swallowed whole, then the creature must make a save at the beginning of each of its turns until it saves ending the damage each turn.