Displacer Beast

Displacer Beast CR: 3

Large monstrosity , lawful evil

Armor Class: 13

Hit Points: 85

Speed: 40 ft

STR

18 +4

DEX

15 +2

CON

16 +3

INT

6 -2

WIS

12 +1

CHA

8 -1

Senses: darkvision 60 ft.

Challenge Rating: 3

Avoidance. If the displacer beast is subjected to an effect that allows it to make a saving throw to take only half damage, it instead takes no damage if it succeeds on the saving throw, and only half damage if it fails.
Displacement. The displacer beast projects a magical illusion that makes it appear to be standing near its actual location, causing attack rolls against it to have disadvantage. If it is hit by an attack, this trait is disrupted until the end of its next turn. This trait is also disrupted while the displacer beast is incapacitated or has a speed of 0.

Actions

Multiattack. The displacer beast makes two attacks with its tentacles.
Tentacle. Melee Weapon Attack: +6 to hit, reach 10 ft., one target. Hit: 7 (1d6 + 4) bludgeoning damage plus 3 (1d6) piercing damage.