Coalescence

A beam of warm, radiant pink healing energy washes through in a 60ft line. Any friendly target caught in the line recovers hit points equal to 4d10 + your spellcasting ability modifier. Any undead creature caught in the line takes the equivalent as radiant damage should they fail on a DEX saving throw. Any undead of CR 1/2 or lower immedately fail the saving throw. Any undead of CR1 takes disadvantage on the saving throw.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher the healing and damage increases by 1d10 for each spell level above 3rd. Subsequently for each spellslot used above 3rd increases the Undead CR that has disadvantage to a maximum of CR 6.