Spellbook of Mors Gotha

A spellbook belonging to the Artakan military leader Mors Gotha.

It somehow got sent to Britannia prior to Ultima Underworld II by the Guardian, in order for mayor Patterson to use it to initiane the spell that would create the Blackrock Dome (the Guardian did the rest of the work). Afterwards it got returned to its owner.

Much later after the Avatar faught Mors Gotha on Atarka, she lost the book during her escape through a Moongate and it fell into the Avatar's hands, who gave it to Nystul for analysis. Nystul managed to use it together with the Horn of Praecor Loth to shatter the dome, freeing Castle Britannia from its prison.