Sheet Lightning

Sheet Lightning is a very strong attack spell, which hurls huge clouds of lightning against the foes, leaving only little standing after doing its job. This however also means that it is quite taxing on the mage and the spell can't be cast all too often without using up all mana reserves.

The spell was invented by a mage in the Abyss who got so annoyed by people asking about it, that he'd turned himself into the Talking Door, what helped little to stop questions. It was from him where the Avatar learned of the spell in Ultima Underworld.