Phantom Warrior

Phantom Warrior CR: 3

Medium undead, any

Armor Class: 16

Hit Points: 45 (6d8 + 18)

Speed: 30 ft

STR

16 +3

DEX

11 +0

CON

16 +3

INT

8 -1

WIS

10 +0

CHA

15 +2

Skills: Perception +2, Stealth +4

Damage Resistances: bludgeoning, piercing, and slashing from nonmagical attacks

Damage Immunities: cold, necrotic, poison

Condition Immunities: charmed, exhaustion, frightened, grappled, paralyzed, petrified, poisoned, prone, restrained

Senses: Darkvision 60 ft., passive Perception 12

Languages: Any languages it knew in life

Challenge Rating: 3

Ethereal Sight. The phantom warrior can see 60 feet into the Ethereal Plane when it is on the Material Plane, and vice versa.
Incorporeal Movement. The phantom warrior can move through other creatures and objects as if they were difficult terrain. It takes 5 (1d10) force damage if it ends its turn inside an object.
Spectral Armor and Shield. The phantom warrior’s AC accounts for its spectral armor and shield.

Actions

Multiattack. The phantom warrior makes two attacks with its spectral longsword.
Spectral Longsword. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 7 (1d8 + 3) force damage.
Etherealness. The phantom warrior 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, and vice versa, yet it can’t affect or be affected by anything on the other plane.

A phantom warrior is the spectral remnant of a willful soldier or knight who perished on the battlefield or died performing its sworn duty. It appears like a translucent version of its living self.