Guardian Aspect (5e Creature)
From D&D Wiki
medium celestial, any alignment, though often lawful neutral
Damage Immunities poison, psychic
Sense Magic. At all times the guardian aspect senses magic within 60 feet of it. Powerful or continuous uses of magic (as well as large, magical locales) can be detected from even greater ranges (at DM's discretion).
Dream Guardian. Nonmagical melee and ranged weapon attacks have disadvantage on attack rolls made against a guardian aspect.
Glaive. Melee Weapon Attack: +5 to hit, reach 10 ft., one target. Hit: 8 (1d10 + 3) slashing damage.
Guardian aspects are fearless dream creatures created specifically to defend servants of the gods of Dream. A guardian aspect resembles an elaborate, animate suit of armor. Though if one were to peer through through the face mask of its helmet, through the eye holes and through the seams in its plates, the inside of the hollow suit of armor cannot be seen. Rather, one would glimpse fantastic vistas and otherworldly landscapes.