Celestial's sacrificial Grace

A caster or creature of the celestial type, or a character of the cleric or paladin classes, can choose a creature that it/they can see within range. A surge of divine energy washes from the caster to the target creature, causing it to regain 2X the casters full remaining hit points. This spell will leave the caster with 1D8+4 hp remaining. This spell also ends blindness, deafness, and any diseases affecting the target. this spell deals 2X the casters full remaining hit points in radiant damage to undead or fiends. this spell does not have any effect on constructs

to use this spell more than once in a day will kill the caster instantly.