Exorcessum

Exorcessum was a greatsword created by gods outside of Toril wielded by the deva Demascus.

Description
It had magic runes on each side which allowed Demascus to call magical abilities. The runes on one side were red and contained martial abilities while the runes on the other side were white and cast beneficial magic.

The sword had multiple configurations and could be split to form two long swords. The final configuration was said to blaze as hot as a star with the capability of incinerating a god.