There is a Legacy version
here.
Incendiary Ashes
[two-actions] Focus 3Uncommon Concentrate Fire Focus Manipulate Oracle Source Divine Mysteries pg. 286Range 120 feet;
Area 20-foot
burstDefense Fortitude
A cloud of magical ashes descends upon creatures in the area. The ashes scour flesh and linger in the wounds, igniting upon the slightest flicker of flame. Creatures in the area take 4d6 slashing damage and must attempt a Fortitude save.
Critical Success The creature is unaffected.
Success The creature takes half damage and has
weakness to
fire 3 until the start of its next turn.
Failure The creature takes full damage and has weakness to fire 3 for 1 minute. If the creature is killed by fire during this time it’s reduced to ashes, though its gear remains.
Critical Failure As failure, except the creature takes double damage.
Heightened (+1) The slashing damage increases by 2d6 and weakness to fire increases by 1.