This is a long way of saying if you're fucked she won't charm anyone, which is a good form of balance.

One big thing to note: There's an AI logic pattern that's a pain to explain but basically sums up to saying Siren won't use this attack first if your team is all in death's door, there's only two of you left and someone's already possessed. This move is a hassle, but is also one of the more mechanically involved attacks in the game. The Siren's primary attack is Siren's Song, which will choose one of your heroes and bring them to the boss' side in order to both reduce your options and possibly decimate your team depending on who gets charmed. Much like the rest of the Big 8, she gets two actions per turn to balance her against your team, with one action reserved for her gimmick. Many of her attacks emphasize AoE damage of various designs, but her main feature is changing the tides of battle by either summoning assistance or stealing assistance from your very team. The Siren is your first boss in the Cove, and she's best described as Hag 2.0.

As penance for not having an episode ready today, let's catch up to these boss fight tips.

Darkest dungeon crashes on cove boss