Black Purrding
Small Ooze (Transformed Beast), chaotic neutral
Armor Class 12
Hit Points 56 (16d6)
Speed 30 ft., climb 30 ft.
   STR        DEX             CON        INT       WIS      CHA
  9 (-1)     15 (+2)         11 (+0)    1 (-5)    9 (-1)    4 (-3)
Skills Stealth +5
Damage Resistances bludgeoning, piercing, and slashing from
  nonmagical weapons
Damage Immunities acid, cold
Condition Immunities grappled, restrained
Senses blindsight 10 ft., darkvision 60 ft., passive perception 9,
  passive Perception 9
Languages —
Challenge 5 (1,800 XP)
Proficiency Bonus +3
Amorphous. The Purrding can move through a space as narrow
as 1 inch wide without squeezing.
Feline Resistance (3/Day). If the Black Purrding fails a Strength,
Dexterity or Constitution saving throw, it can choose to
succeed instead.
Is that a snake?. At the start of the Black Purrding’s turn, if
there is a cylindrical, elongated object in its line of sight, the
Black Purrding must make a DC 14 Wisdom saving throw, or
be frightened until the beginning of its next turn. Each object
can only trigger this trait once.
Shadow Stealth. While in dim light or darkness, the Black
Purrding can take the Hide action as a bonus action.
Spiderclimb. The Purrding can climb difficult surfaces,
including upside down on ceilings, without needing to make an
ability check.
Actions
Pseudopawd. Melee Weapon Attack: +5 to hit, reach 5 ft., one
target. Hit: 4 (1d6) 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.
The Zoomies! (Recharge 5–6). The Black Purrding starts running
in a 20-foot radius circle, shedding its acid fur. Each creature
within the circle must make a DC 13 Dexterity saving throw or
take 21 (6d6) Acid damage.