Due to his unique infestation by a mind flayer tadpole, Astarion could move freely during the daylight hours and enter homes uninvited. However, he was still affected by running water, which burned him like acid.
While others with the same infection sought to rid themselves of the parasite, Astarion sought to control it and gain mastery over his new powers.
Astarion was turned some time before or during the 13th century DR.
In the Year of Three Ships Sailing, 1492 DR, Astarion began seducing a young fellow noble, trying to lure him towards his master. However, he was kidnapped by a mind flayer, placed into a holding pod in a nautiloid, and infected with an illithid tadpole. As the spelljammer passed over Yartar, it was assailed by githyanki who rode atop red dragons. After the nautiloid teleported through the planes, it crashed, and Astarion ended up somewhere across the River Chionthar.
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