Spellcasting. The remnant casts one of the following spells, requiring no material components and using Intelligence as the spellcasting ability (spell save DC 13):

At will: mage armor, mage hand, prestidigitation

1/day each: bane, dimension door, web

Multiattack. The remnant makes two Necrotic Surge attacks.

Necrotic Surge. Melee or Ranged Spell Attack: +5 to hit, reach 5 ft. or range 120 ft., one target. Hit:14 (2d10 + 3) necrotic damage.

Phase (2/Day). The remnant becomes partially incorporeal for as long as it maintains concentration on the effect (as if concentrating on a spell). While partially incorporeal, the remnant has resistance to bludgeoning, piercing, and slashing damage.