Amorphous Form

You transform a willing creature you touch, along with everything it's wearing and carrying, to become amorphous and ooze-like. This new form is boneless and fluid, enabling the subject to pass through holes or narrow openings as small as 1 inch in diameter. 

While in this form, the target is immune to acid and poison damage, polymorphing, and the stunned, prone and poisoned conditions. It gains a swim speed (if it does not have one already) equal to its walking speed. The subject can remain submerged as long as desired without breathing. The target’s armor (including natural armor) becomes worthless, the target's Armor Class equals 10 + your Dexterity modifier + your Constitution modifier.

While in the amorphous form, the target can't talk or manipulate objects, and any objects it was carrying or holding can't be dropped, used, or otherwise interacted with. The target can't attack or cast spells.