The Sword of Tregain is a short magic sword that once belonged to Tregain, a prince of Stormguard Castle. The blade was crafted by master smiths with the help of a wizard named Egar. It tends to push attention away from itself when it is unsheathed, and the effect increases with the size of the attacking creature.

Additionally, in great need and at the price of the blade, with the phrase 'Sharpness begone', the blade will become a bolt of lightning, leaving only the hilt.

It is one of the weapons kept by Grippa in the Blackwell Keep, and was lent to Seth Sorenson.