Water Elemental Vessel

By performing an hour-long ritual, an elemental vessel can form a spell circle with an arcane or primal spellcaster. After the spell circle is formed, other spellcasters can join the spell circle by performing the same hour-long ritual while assisted by at least one spellcaster already in the spell circle. Each member of the spell circle must contribute at least one spell to the elemental vessel. The spellcaster permanently loses access to a spell slot equal to the spell's rank and the elemental

Whenever a creature successfully counteracts one of its spells, the vessel permanently loses access to that spell and takes damage equal to 4 × the spell's rank. The spell circle member who contributed that spell regains access to their contributed spell slot.

Any member of the elemental vessel's spell circle can spend 3 actions to mentally inhabit the vessel for 1 round. While they inhabit the vessel, the inhabiter controls the vessel's actions, and the vessel uses the inhabiter's Intelligence, Wisdom, and Charisma modifiers for all checks. Only one creature can inhabit an elemental vessel at a time.

DC 35 reflex save, no damage, , Rupture 28

The elemental vessel targets an engulfed creature with one of its spells. The spell must have a range of touch.