[RPG] What happens if you drop a 30-foot cube of water from a height of 30+ feet on someone’s head using the Create or Destroy Water spell

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In D&D 5e, what would happen if you dropped a 30-foot cube of water from a height of 30 feet (or more depending on elevation and positioning) on someone's head, using the Create or Destroy Water spell?

Best Answer

Create or destroy water doesn't do that.

The spell description of create or destroy water states (PHB, p. 229; emphasis mine):

Create Water. You create up to 10 gallons of clean water within range in an open container. Alternatively, the water falls as rain in a 30-foot cube within range, extinguishing exposed flames in the area.

It makes it rain, which does zero damage.