Fire Shield

Fire Shield is one of the few defensive spells in this otherwise offensive-oriented school of magic.

Spell Description
Casting this spell creates a ring of fires around the Sorcerer, which completely blocks off access to anyone except daemons, which still can simply walk through the fires. Once shielded this way, the Sorcerer has all time in the world to pelt the helpless foes with ranged attack spells, until they are all dead. Of course, this won't be useful against foes with distance attacks.