Nemetos

Nemetos is a unique weapon. It takes on the form of any metallic weapon the wielder wishes and can fire radiant energy, provided the wielder is fit enough to focus this energy.

Background
Nemetos was once owned by Calenhad Theirin. It was lost during the Second Orlesian Invasion of Ferelden.

The sword came into possession of the Disciples of Andraste, dragon cultists who used the sword in a blood ritual. The sword was stolen by Jethrow Sunworth when he left the cult and settled down in Kirkwall. It was passed down to his daughter, and into the Beltore family.

Dragon Age: Intervention
Eventually, the sword was passed down to Lyeldan Beltore's adoptive parents. They hid the sword beneath the floorboards of their home where it sat for decades. In 9:32 Dragon, Lyeldan finds and reclaims the sword as his own. He uses the blade to slay the demon Justiel.