Rakken in Cursed Shore is bugged, he just stands outside the camp and won’t sell his item (Experimental Remnant) which is needed for the Colossus Pre Curser.
With no forcing map changes ( tried Guesting ) this has halted my progress on my Legendary.
It would be better if you could report that through in-game Bug Report tool, that way devs can gather more info than we can provide. Also, with the Megaserver thing it would be easier to provide what server IP was it, events can stall in an instance while work well in another, in this case the in-game tool helps to tell what instance was it.
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