Delayed Icicles

When you cast Delayed Icicles, you choose a five-foot square on the ceiling, from which icicles form. The icicles will fall on a creature that passes underneath them, and the creature must immediately make a dexterity saving throw. If they succeed, the spell has no effect, and the icicles shatter on the ground harmlessly, ending the spell. If the creature fails, that creature takes 6d6 piercing damage and 1d10 cold damage. A creature can avoid these if they make a perception check while you are casting the spell, contesting your spell save DC.