Ish. Llengrath leaving is causing a lot of issues, so I'm looking to adjust that in our next patch. It's a big change, though, so I'm being careful with it. Regardless, there should be some solution in the next update.
I think there are actually some hints as to that (if not straight up answers) in some of the Oracle and Godseed content.
In other news, here's my extremely professional and skilled concept art for the body beneath the Halls Obscured:
sail around the map for 10 days couldn't trigger the llengrath event
is there some requirement for it?
already triggered the island cracking tsunami event