Ethereal Slayer CR: 5

Medium monstrosity, chaotic evil

Armor Class: 18 (Natural Armor)

Hit Points: 104 (16d8 + 32) 16d8+32

Speed: 50 ft

STR

12 +1

DEX

19 +4

CON

14 +2

INT

5 -3

WIS

16 +3

CHA

9 -1

Saving Throws: Strength +4, Dexterity +7, Constitution +5

Skills:

Athletics +7, Perception +9, Stealth +10

Senses:

Darkvision 60', Passive Perception 21

Languages: -

Challenge Rating: 5 ( 1800 XP)

Proficiency Bonus: +3

Innate Spellcasting.

At will: Detect Magic
2/day: Plane Shift (self only)

Etherealness. The ethereal slayer enters the Ethereal Plane from the Material Plane, or vice versa. It is visible on the Material Plane while it is in the Border Ethereal, & vice versa, yet it can't affect or be affected by anything on the other plane.

Actions

Multiattack. The ethereal slayer makes two claw & one bite attacks.

Claw. Melee Weapon Attack: +7 to hit, 5' reach, one target. Hit: 9 (1d10 + 4) 1d8+4 slashing damage.

Bite. Melee Weapon Attack: +7 to hit, 5' reach, one target. Hit: 8 (1d8 + 4) 1d6+4 piercing damage.

Bonus Actions

Dimensional Anchor. Once per turn, when the ethereal slayer hits a creature with an attack, it blocks extradimensional travel for that creature. All forms of dimensional travel, such as via Astral Projection, Blink, Dimension Door, Etherealness, Plane Shift, Teleport or similar spell-like abilities. It also prevents the creature from using magic items used for extradimensional travel, including portals & teleportation circles. This effect lasts for 1 minute.

This ability does not interfere with the movement of creatures already in ethereal or astral form & does not block extradimensional perception or attack forms. Also, it doesn't prevent a summoned creature from disappearing at the end of a summoning spell.