Feldon 
A handful of players have been reporting an intermittent glitch with the Phantom Seas signature quest line, specifically at the Allu’thua Abduction subquest. The quest reaches a point where hailing the needed NPC no longer updates the quest. We’re unsure of how many people have experienced this issue. We did not find a Bug Report for it on the DGC Issue Tracker website.
EQ2 designer extraordinaire Kaitheel has responded to the thread a couple of times and reports that the code side are looking into where the quest might be going awry.