Elegy

You hum an old funeral dirge imbued with magic that cloaks one in the darkness of undeath. Choose up to six allied creatures within 10 feet of you. For the duration, you and those six allied creatures appear as undead to any detection or divination spells. Any undead creatures have disadvantage on Perception or Investigation checks made to discern you and the selected creatures. If you make a sneak attack on an undead creature while under the spell's effect, the attack has advantage, and you are not detected even if the attack misses.