Grafted Spirit Hide is Fenris's companion armor in Dragon Age II. Its armor rating is level-dependent.
Acquisition
Fenris will have Grafted Spirit Hide and Lethendralis equipped when joining the party during the Act 1 quest Bait and Switch.
Romance
Fenris adds a red band around his right glove and an Amell family crest to his belt if romanced by Hawke in Act 2.
Upgrades
Lyrium Scales (Act 2)
Reinforced Straps (Act 2)
Tevinter Spirit Symbol (Act 2)
Enchanted Resin (Act 3)