From Pathfinder Impossible Magic, which isn't enabled.

Calcium Rain

SPELL 5

Traditions arcane, divine, occult

Cast

Range 60 feet

Area 30-foot burst

Defense basic Reflex

You conjure a horrific cloud of tiny dancing bone shards that collapses like a torrent of rain upon those unfortunate enough to be nearby. Creatures in the area take 10d4 piercing damage and 5 persistent bleed damage (basic Reflex save).

Heightened (+1) The piercing damage increases by 2d4, and the persistent bleed damage increases by 1.

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