Yep, Marx does Ore Refinement once you did the 5 quests.
Same rate as in Snow Hill mine:
7 gemstones -> 1 med qual / piece
5 med qual /piece -> 1 hi qual /crystal
3 hi qual / crystal -> 1 highest refine stone.
Going to check out for Reina in Abyss o.o
As it seems, Reina has a problem with the wrecked ship on her right. That would aim at two possibilities
-> Relation with Karan (as there're Channas around)?
-> Gateway for an hypothetic Abyss Boss? (since Reina acts the same way for Tombeth)?
Ice Trial 5 - Jail:
2 NPCs: Horse Hiddink (center of the room) who gives the quest to get back to Ice trial 4
Queen Odinea NPC (top right of the room), who gives the quest related to the Cold Hearted set. Unfortunately, there's no title for the quest itself, because it's a MQ o.o