Call of the Winged Horror

You rally the living dead, lifting the thralls around you, granting up to four ally undead within 60 feet of you the following benefits until the spell ends:

• It gains a flying speed equal to its walking speed if it doesn't have one already.
• Its hit point maximum increase by an amount equal to five times the spells level.
• Its attack rolls gain a bonus to hit equal to the spells level.

When the spell ends, make a DC 15 Constitution saving throw. On a failed save, any undead which benefited from this spell are instantly destroyed. On a successful save, the benefited undead can't move or take actions until after its next turn, as the magic reanimating them momentarily wicks out.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the DC when the spell ends increases by 1 and you can target one additional ally undead for each slot level above 3rd.