Deadly Lahar

(Complete Mage, DnD 3.5)

Conjuration[Fire], [Earth]

Level: ; Druid 8; Sorcerer/Wizard 8; Wu Jen 8
Components: V, S
Casting Time: 1 standard action
Range: 60 ft.
Area: Cone-shaped spread
Duration: Instantaneous
Saving Throw: Reflex partial
Spell Resistance: No

A rushing torrent of liquid rock bursts from the ground, washing over your foes.
You create a liquid landslide of molten-hot volcanic material.
All creatures in the area of the spell take 10d6 points of fire damage.
Additionally, those creatures are coated in a thick layer of the viscous substance, slowing them (as the slow spell) for the next 3 rounds and dealing an additional 5d6 points of fire damage per round.
A successful Reflex save reduces the initial damage by half and prevents the slow effect and the additional damage.