if i use the item to activate a nightmare dungeon, do i have to enter and complete that dungeon immediately or can i activate and then logoff?
also, is there anything to locate a dungeon easily on the map?
eg. nightmare dungeon item for auldur wood in Scosglen… im then searching for ages for that dungeon
If you log off, the nightmare dungeon will disappear so be sure to only use one when you’ll be able to do it before logging off (or live with the missed opportunity - it ends up not costing very much at all).
For your second issue, there’s not really a mechanism for that. Just zoom out in the map a bit and look for the icon. It’s different enough from all the other icons in colour that you should be able to spot it easily enough. However, if you open the map first thing after activating a sigil it will automatically be centered on the nightmare dungeon.
If its for sigils you dont have to be near it to use it when its used the dungeon symbol changes becomes very easy to spot. If youre after a specific aspect you can tag the relevant dungeon from the aspect codex