Summon Drakes
Summon Drakes is a monster-only spell which summons several of the following reptiles into existence:
Although individually not terribly dangerous, these monsters can sicken you, confuse you, rot you, and burn your scrolls, and you usually end up having to face a variety of them at once along with the summoner himself. Fortunately, you'll likely have resistance to fire and poison by the time you face this spell, leaving you with only sickness and rot to worry about. Try to clear out the death drakes as quickly as possible (Abjuration works wonders).
The following enemies cast Summon Drakes: