Planescape Monsters for 5e: The Xeg-Yi

Xeg-Yi

Incredibly rare creatures thought to be sentient balls of pure necrotic energy, residing on the Negative Energy Plane. It is thought that if a Xeg-Yi were ever to see its Positive Energy counterpart, the Xag-Ya, both creatures would be overwhelmingly compelled to collide and annihilate each other.

Deeply alien creatures. Some are curious, some are murderous.

 

Medium aberration, unaligned

AC 18
HP 66
Speed Fly 20ft
Saving Throw Proficiencies: All (+3 prof. bonus)

STR 3 (-4)

DEX 16 (+3)

CON 16 (+3)

INT 10 (+0)

WIS 12 (+1)

CHA 16 (+3)

Damage Immunities: Acid, cold, lightning, necrotic, poison, psychic, thunder; bludgeoning, piercing, and slashing from nonmagical weapons
Condition Immunities: charmed, frightened, grappled, petrified, prone, restrained, stunned
Senses: darkvision 120 ft, passive Perception 11
Languages: Deep Speech
Challenge: 2 (450XP)

Explosion. If it is reduced to 0 hit points, the Xeg-Yi explodes. Creatures within 10ft of the Xeg-Yi must make a DEX saving throw, taking 3d6 necrotic damage on a failure and half as much on a success. If a creature that fails this save is wearing nonmagical armor, the armor suffers a -1 penalty to its AC.

Corrosive Form. A nonmagical melee weapon that hits the Xeg-Yi suffers a permanent -1 penalty to attack and damage rolls. The weapon is destroyed if this penalty reaches -5.

Multiattack. The Xeg-Yi makes two Energy Lash attacks and uses its Energy Bolt, if available.

Energy Lash. Melee Weapon Attack: +7 to hit, one target. Hit: 14 (3d6+4) necrotic damage.

Energy Bolt (Recharge 4-6). The Xeg-Yi launches a bolt of energy at a point within 10ft. The bolt explodes in a 5 ft radius. Creatures within this radius must make on a DC 15 DEX saving throw, taking 6d6 necrotic damage on a failure and half as much on a success. If a creature that fails this save is wearing nonmagical armor, the armor suffers a -1 penalty to its AC.

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