Endurance of the Grave

Your necromantic magics boost all undead allies that are within 30 feet of you.

Until the spell ends, the undead allies within range have advantage on saving throws that Turn Undead, and advantage on saving throws for the Undead Fortitude feature.

At higher levels. When you cast this spell using a spell slot of 5th level or higher, the radius of the spell is increased by an additional 30 feet for each spell slot above 4th.