No, his weapon (which isn't unique) is summoned as a Supernatural ability. Heldenmut itself A) eats magic, so trying to summon it would be... interesting, to say the least, and B) is passed down from Barachiel to Barachiel. Also, it seemed like it would be a fun plot hook for some Celestia focused PCs; Heldenmut is stolen, and Barachiel cannot leave Celestia. He hires PCs (who are probably epic level) to go find it, etc.