…on the Lagon quest line, after beating him/her/it eventually you will come to the step where you have to ‘Board the ship to [Soreth’Ka]’. I happen to leave the game before doing that step and on returning the follow-up golden quest marker is placed in End of Time… but there is nothing there. As it turns out it requires travelling to Tethima in the Divine Era where a quest pointer will be available.
I have had things like this before and the answer then was, replay the questline and you’ll be fine. So I did to this time, killed Lagon again and luckily it crashed on portal exit. Great fun!
Please add a ‘I am a nub, point me in the right direction’ button, thank you.