The Traveler's Guide to Aellorah
Beckoned Spirit. The phantasm does not require air, food, water, or sleep. When it takes necrotic damage, it is instead healed for an equal amount. It is also vulnerable to radiant damage.
Sunlight Sensitivity. The phantasm has disadvantage on attack rolls, as well as on Wisdom (Perception) checks that rely on sight.
Aura of Fear. The phantasm's horrifying visage strikes fear into those that can see it. Creatures within 30 ft. of the phantasm have disadvantage on saving throws against effects that would cause them to become frightened.
Mind Spike. Ranged Spell Attack: (+5) 1d20+5 to hit, range 30 ft., one target. Hit: 14 (3d6+3) 3d6+3 psychic damage.
Nightmare (Recharge 6). The phantasm reaches into the minds of creatures around it to cause them to experience their worst fears. Creatures within 15 ft. of the phantasm must succeed on a DC 14 Wisdom saving throw or become frightened for 1 minute.
The phantasm is horrifying to look at, and uses its revolting appearance and ability to delve into the subconscious of nearby creatures to pry into their deepest fears and use those fears against them.