Cimelimus Addofortus (Megasiphonophore)

Consumption. Every creature consumed it grows slightly larger & stores its CR as a bunch of points. It can spend two at a time to increase any stat or its hit points by one, or five at a time to give itself any of the following features.

• Eyes. Two big black bulbs give it 60ft of vision.
• Legs. Four chitin limbs give it +5ft of walking & climbing speed, & +1 to its amor class (only the next additional 2 sets give it +1).
• Claws. Two curved spikes lined with smaller spikes on the inside or underside (depending on whether they face in or down) deal 2d8 piercing damage on a successful snap.
• Wings. A pair of thin transparent wings give it +3ft of flying speed & +3 to its armor class (only the next additional pair gives it additional +3).
• Stinger. A sharp protrusion with a venom-filled bulb forces victims to make a con save or take 1d4 poison damage at the start of every turn.
• Antennae. Two large thin protrusions give it 30ft of blindsight (+10ft of blindsight for every additional pair).
• Armor. Chitin plating on a particular segment gives it +10 to its armor class (not stackable, -1 from this for every 2 segments unprotected). Wings on this segment become elytra.

Additional of the same type of parts on the same segment can be more pairs/parts or bigger versions of the preexisting parts. Every 24 hours the creature can reshuffle its CR points.

Combine. These things can link themselves to each other & when they do so they pool all of their stats, hit points, & CR points, & act as one entity, its body of ball-based segments the only sign of its previous separation. If it has some segments protruding out these have a reach of 5ft times the number of segments its made of.

Adaption. The creature takes on the colors of its environment & a resistance to damage common in that environment (ie up on snowy peaks they may be icy blue with cold damage resistances).

Eating. The creature will grapple onto a flesh-based entity, if successful it deals 1d6 acid damage every turn.