The Copper Axe (鋼の斧 Kou no Ono, Steel Axe) was one of the surviving relics of Gremio following his death at Soniere Prison. Viktor retrieved the axe from Soniere Prison just after Gremio's death[1].
Following this, Viktor kept possession on the axe, thinking it might sadden Tir to see it[2]. He returned it to Tir before the Battle at Floating Fortress Shasarazade, in case he died during the battle[3].
Trivia
- Even if Gremio is brought back to life by Leknaat, the Copper Axe will remain in your inventory.