[Lilandra_Fury]

Very minor Spoilers
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I have killed the big orb with the rift device, and now I have taken the door that takes me back to the tombs where but the door at the bottom is locked - is there a key (i have looked but can't find it) or should I just back track?

also the orbs (Can't remember their names but the floating thing s with the eyes) what is the defence against their blasts?

Thanks for your help