Mabuns might give you a little coin for your Abyss equipment, but the real deals are to be found right here.

Just because you're a member of the [%userguildname] Legion, you get a special rate, see?

Sell Reward for Contribution

[%username], you don't belong to the legion that captured the fortress.

If you want coin for your Abyss equipment, go talk to Mabuns.

"I'll see if I can find him."