Which I don't mind, because otherwise it would allow to stack keys for about 3 months without premium pass, but I would recommend still buff Synthesis Vessels and Winterblight Glacier Stones particularly, because you can use entire stock of your vessels in one turn, while glacier stones being used 3 per run usually and it takes only 6 runs to completely drain them (tho they replenish fast too, so might not be a worthy problem, like vessels are).
Which I don't mind, because otherwise it would allow to stack keys for about 3 months without premium pass, but I would recommend still buff Synthesis Vessels and Winterblight Glacier Stones particularly, because you can use entire stock of your vessels in one turn, while glacier stones being used 3 per run usually and it takes only 6 runs to completely drain them (tho they replenish fast too, so might not be a worthy problem, like vessels are).