So, I am seeing it as a sort of crafting locale in which you'll have to travel the Ruins of Sescheron and enter the Tomb of the King to use it. Everytime I want to use it, you'll have to go there. I would actually like to see that. It would very well be an excellent way of making players work for the good stuff, not just get everything done while in-town. It is a very interesting mechanic, too. I'm going to love it, specially putting an In-Geom passive on a Fornace or a BK, or you can even put a Convention of the Elements passive on Focus or Restraint. Things like these give us so much more options, but I am sure there will be restrictions, too. Besides the "Only 1 Legendary trait per type or equipment", there must be something else. It would be too good to be just as simple as that, right?
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"We were meant for more than this! We were not meant for Heaven nor Hell... But to a place beyond the depths and above the skies! " - Gurthalas, Cruel Angel of Wind and Flame.
Blues already said that u will gain access to cube in town after u finish off the quest.
There will be only standard class restrictions, it will work exacly like additional equipment slots. For now they only mentioned that you wont be able to put hellfire amulet legendary there.
Sure it will have strong effect, but it wont be anything game breaking i think. Sets and rings from season 3 have much stronger effect than mixing any weapon with furnace for example. Overall its good change, cos it will affect lots of items, not only the new ones and thats imho the way to go.