Sources
CR
Type
Size
Alignment
Movement

Majesto

Tiny Fiend (devil), Lawful Evil

Armor Class 13
Hit Points 10 (3d4 + 3)
Speed 20 ft., fly 40 ft.
STR
6
-2
DEX
17
+3
CON
13
+1
INT
11
+0
WIS
12
+1
CHA
14
+2
Skills Deception +4, Insight +3, Persuasion +4, Stealth +5
Damage Resistances cold; bludgeoning, piercing, slashing, from nonmagical attacks not made with silvered weapons
Damage Immunities fire, poison
Condition Immunities Poisoned
Senses darkvision 120 ft., passive Perception 11
Languages Infernal, Common
Challenge 1 (200 XP)

Traits

Shapechanger. Majesto can use its action to polymorph into a beast form that resembles a rat (speed 20 ft.), a raven (20 ft., fly 60 ft.), or a spider (20 ft., climb 20 ft.), or back into its true form. Its statistics are the same in each form, except for the speed changes noted. Any equipment it is wearing or carrying isn't transformed. It reverts to its true form if it dies.

Devil's Sight. Magical darkness doesn't impede Majesto's darkvision.

Magic Resistance. Majesto has advantage on saving throws against spells and other magical effects.

Actions

Sting (Bite in Beast Form). Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit:5 (1d4 + 3) piercing damage, and the target must make a DC 11 Constitution saving throw, taking 10 (3d6) poison damage on a failed save, or half as much damage on a successful one.

Invisibility. Majesto magically turns invisible until it attacks, or until its concentration ends (as if concentrating on a spell). Any equipment the imp wears or carries is invisible with it.