Multiattack. The megapede makes one Bite attack and uses either Life Drain or Psychic Bomb.

Bite. Melee Weapon Attack: +10 to hit, reach 20 ft., one target. Hit: 22 (3d10 + 6) piercing damage plus 22 (5d8) poison damage.

Life Drain. The megapede magically drains life energy from other creatures nearby. Each creature within 15 feet of the megapede must make a DC 15 Constitution saving throw, taking 16 (3d10) necrotic damage on a failed save, or half as much damage on a successful one.

Psychic Bomb. The megapede targets one creature it can see within 60 feet of itself. The target must make a DC 15 Wisdom saving throw. On a failed save, the target takes 22 (5d8) psychic damage and is incapacitated until the end of its next turn. On a successful save, the target takes half as much damage and isn't incapacitated.