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TEN sirenes interrupt rest at lighthouse in chapter 3?!
As primarily a paladin player, I've farmed a sirene or two in my day. I never recall seeing more than 6 (and that was post Candlekeep catacombs). Perhaps this change was made to stop people from farming the easy XP of one or a few sirenes.
Thankfully, my charname is an Inquisitor and Xan had sleep memorized.