Corpselight

You touch a Medium or smaller corpse or Undead. Until the spell ends, the corpse sheds bright light in a 15-foot radius and dim light for an additional 15 feet. Completely covering the corpse with something opaque blocks the light. The light can be ghostly white, pale yellow, eerie green, fiery amber, or bloody red. The spell ends if you cast it again or dismiss it as an action or bonus action.

If you target a hostile Undead, that Undead must succeed on a Dexterity saving throw to avoid the spell.

At higher levels. When you reach fifth level, the spell can target up to two Small or smaller corpses or three Tiny corpses. At eleventh level, you can also target one Large corpse or up to four Tiny corpses. At seventeenth level, you can target up to two Medium or smaller creatures or three Small or smaller creatures.