SO question......do we miss out on anything if all we able to do during the event is kill a few dozen Psionic Thralls? Like any items or rewards only available during the event? Also once a lair is discovered anyone have a clue how long it is available? some the quest i haven't unlocked reaper yet.....
afaik they stay active until depleted of invaders. This requires a specific number of Illithid kills, and is tracked by server. First wave was only something like 10, and was over way to fast. Second wave was closer to 30-50 kills. Not sure about wave 3, but it seems to also be 30-50?
As for actual time they last, not sure. They've always been up until "exhausted" by killing the invaders illithids.
Someone near the beginning said that killing thralls helps spawn the Illithid Invaders, but I have no clue if that is true or just speculation.
Alas, other than enjoying the atmosphere and challenge of the thralls, and the early access to the new quests, there are no traditional rewards for killing the thralls during this event afaik.