From Pathfinder Impossible Magic, which isn't enabled.

Firestarter Pellets (Greater)

ITEM 10

Price 175 gp

Usage held in 1 hand

Bulk L

Category catalyst

Activate Cast a Spell (add 1 action)

These compacted pellets of bat guano, sulfur, and magical accelerants have long been a staple for spellcasters on the battlefield. Adding a firestarter pellet to a Fireball spell produces clinging flames that deal 2d6 persistent fire damage to all who fail the saving throw against the effect (4d6 persistent fire damage on a critical failure).

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