Barbitutary (Barb)

Amorphous. Barb can move through a space as narrow as 1 inch wide without squeezing.

Corrosive Form. A creature that touches Barb or hits it with a melee attack while within 5 feet of it takes  (4d8) acid damage. Any nonmagical weapon made of metal or wood that hits Barb corrodes. After dealing damage, the weapon takes a permanent and cumulative −1 penalty to damage rolls. If its penalty drops to −5, the weapon is destroyed.

Nonmagical ammunition made of metal or wood that hits Barb is destroyed after dealing damage.

Barb can eat through 2-inch-thick, nonmagical wood or metal in 1 round.

Spider Climb. Barb can climb difficult surfaces, including upside down on ceilings, without needing to make an ability check.

Pseudopod. Melee Weapon Attack: +12 to hit, reach 20 ft., one target. Hit:  (3d6 +2d4+3) bludgeoning damage plus 18 (4d8) acid damage. In addition, nonmagical armor worn by the target is partly dissolved and takes a permanent and cumulative −1 penalty to the AC it offers. The armor is destroyed if the penalty reduces its AC to 10.

Split. When Barb is subjected to lightning or slashing damage, it splits into a new Barb at the start of the next round. Each new Barb has hit points equal to half the original Barb's, rounded down. New Barbs are two sizes smaller than the original Barb. Roll 1d4 to determine which split it is 

1- Euphoria

2-Fear Hugger

3-Petryfying 

4-Rot

Barb Has 4 Legendary Actions

Immolating Gaze (Costs 2 Actions). Barb turns her gaze toward one creature she can see within 120 feet of her and commands it to combust. The target must succeed on a DC 20 Wisdom saving throw or take 22 (4d10) fire damage.

Paralyzing Touch (Costs 2 Actions). Melee Spell Attack: +18 to hit, reach 5 ft., one creature. Hit: 10 (3d6) cold damage. The target must succeed on a DC 20 CON saving throw or be paralyzed for 1 minute. The target can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.