Enhanced Holy Water

By enchancing the holy water and throwing it, it explodes like a grenade in a cascade of holy water. Creatures in a 15-foot radius of the impact zone must make a Dexterity saving throw against the glass fragments or take 1d6 piercing damage as shards of glass hit them. Afterwards, each creature is doused with the holy water, so they will have to make a Constitution saving throw or take 3d6 radiant damage. On a success on any of the saving throws, the creature only takes half the damage from that source, like half of the piercing damage if they succeeded on the Dexterity saving throw. Both saving throws uses your spell casting DC. 

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the radiant damage increases by a 1d6 for each level of the spell slot above 3rd level.