Accustomed to life in dark, wet caverns, you have superior vision in dark and dim conditions. You can see in dim light within 60 feet of you as if it were bright light, and in darkness as if it were dim light. You can’t discern colour in darkness, only shades of grey.

You have resistance to acid damage, and you know the acid splash cantrip, which you can make unavoidable when cast at point blank range. If you cast the spell only targeting a creature you’re currently grappling or grappled by, the target automatically fails its saving throw. Constitution is your spellcasting ability for this spell.

As an action, you can alter your body to assume the form of a cube or a puddle for up to 1 hour. While in either of these forms, you can’t talk; manipulate objects; make attacks; or cast spells. The form you assume has the following effects:

• Cube Form

Your walking speed is halved and your body becomes a 5-foot cube. You can safely store any items you are carrying, holding, or wearing in a vesicle within you body. Creatures
directly behind you have three-quarters cover against attacks that originate on the opposite side of you. You also gain a new action option, the Engulf action:

       Engulf:  You move up to your speed and can move into the space of one creature of equal or smaller size than you, which must make a Dexterity saving throw (DC = 8 + your Strength modifier + your proficiency bonus). On a failure, if you aren’t already grappling a creature, the creature becomes grappled by you. While grappled in this way, the creature is restrained and takes acid damage at the start of each of its turns as if it had failed a saving throw against your acid splash cantrip.

• Puddle Form.

Your walking speed is halved as you collapse into a 5-foot-diameter pool. You can’t hold or carry items and any objects you are holding, carrying, or wearing when you transform falls to the ground in your space. While in this form, attack rolls by creatures further than 5 feet away from you have disadvantage to hit you, you nonmagically gain the benefits of the spider climb spell, and you can travel through spaces as small as 1 inch wide without squeezing.