Cloak of Ooze

Wondrous item, rare (requires attunement by a druid or ranger)

This cloak of protection is made of firm, damageresistant green ooze that undulates disturbingly.

Radiates: Abjuration and transmutation magic.

Power: You gain the gray ooze traits of amorphous and blindsight (60 feet).

Power: You may speak with ooze and ooze-like creatures at will via limited two-way telepathy; only simple words, images, and sensory impressions can be sent.

Power: You may cast grease a number of times per day equal to your proficiency modifier, except it is not grease, but slippery slime that sprays from your cloak.

It looks exactly like green slime.