This spell was inspired by those Ghoul Lord guys in Diablo 2. Tell me what you think, especially what level you think it should be.
Grim led the group through the tunnels of mist. Close behind he could hear the iron-shod boots of the hobgoblins, and they were gaining. The exit wasn't far ahead, but they would never make it, and the 10 foot width of the rough-hewn tunnel meant that he would be unable to hold off the hobgoblins long enough for his group to escape, for they would just surround him and bring him down.
"We're done for," he panted to Khadufel, the mysterious ebon-skinned wizard at his side.
"Not yet, Grim, came the reply. "I still have one trick up my sleave." With a wave of his arm, the path behind them burst into a thick carpet of flame. "Let's see them get through that," grinned the mage. Grim felt a smile come to his own face as the hobgoblins came into sight but stopped short at the sight of the flaming ground. They just might make it yet.
Carpet of Flame
Level: wiz/sorc 4
Components: V,S, M
Casting Time: 1 Standard Action
Range: Close (25 ft. + 5 ft. per 2/levels)
Area: 5' per 2/levels (see text)
Duration:1 round per level
Saving throw: Ref partial (see text)
Spell resistance: yes
This spell calls into being a carpet of fire that covers an area of the ground and burns to a height of 8 inches. Anyone standing or moving through the the area is allowed a reflex save for half damage per round. The spell does 1d4 points fire damage per level of the caster. The caster can choose which areas of the ground to cover, in any pattern, as long as all 5' squares chosen are adjacent to another square which is on fire because of this spell. The material compenent of this spell is a pinch of tar and sulphur.