Fire Shield

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

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 foes with attack spells, until they are all dead.

Of course, this won't work against foes with distance attacks.