I think, with the level of threat in the mines, the cost of Silvered Weapons should reflect that. Those shadow critters are NASTY, You would have to be a bad ass to do the mines alone.
Thraxys held his own... but with the aid of multiple magical boosts from Frank. Alone, I think he would be a dead man... least he can hide like a sunofagun
Kept him alive multiple times in there.