A pink, humanoid blob staggers into the arena. Its skin is transparent, revealing a single eye that swims through his watery insides like a fish through a pond.

The eye sinks to the bottom of its stomach but quickly retracts to the top of its head when you approach. - Deathmatch at the Colosseum of Ashes (RPA-SQ1) 

A pink, viscous bipedal creature. Inside a Pink Blob is its strength, but perhaps also its weakness;

Its watery insides make your eyes sting. Soon, you start to run out of air. You struggle desperately, but that seems to only make things worse.

You manage to cut a slit in the blob’s skin from the inside. It recoils, and you take advantage of this momentary distraction to pull yourself loose. - Deathmatch at the Colosseum of Ashes (RPA-SQ1)

The Pink Blob is a variant of the Ooze.

Similar to how an Ooze consumes its prey, the Pink Blob also envelops their targets to suffocate and immobilize them:

Without warning, its stomach bulges and wraps itself around your hand. With incredible force, the creature pulls you in. - Deathmatch at the Colosseum of Ashes (RPA-SQ1)

It is also able to hold objects in its form;

Gasping for breath, you glance back up at the blob to discover that your armor and weapons are still stuck inside its body. - Deathmatch at the Colosseum of Ashes (RPA-SQ1)

The creature pulls you into itself, where you must find a way out:

• Doing nothing ends the match quickly in a rather uneventful stalemate. You find the Pink Blob's eyeball after the Grandmaster calls the fight.
• You escape the blob, at the expense of your equipment.
• You identify its weak spot and capitalize on its vulnerability;

Rather than struggling to pull your hand out, you let your entire arm slip in. Then you reach up to grab its eye. It recoils and you are able to yank the eye from its body. When you do so, its body falls apart. It immediately turns to liquid and splashes over the ashes of the arena. - Deathmatch at the Colosseum of Ashes (RPA-SQ1)