He should sell it. This way I can finally get one. I laugh when people say they earned their Gjallahorns. I have carried people through raids with less than 50 hours in the game that have gotten hawkmoons and gjallahorns and they were dead when the weapons dropped. There is no such thing as earning a specific weapon. Once you are high enough level to do raids and nightfalls you have earned your way into RNG. After that it is all luck.