I need some guidance against Playful Darkness; I'm positive they can be beat, but I'm not understanding how to do it with my party.

I'm on PC, Core difficulty. Haven't really struggled with the difficulty except at Blackwater, and that was just an unfun slog, not actually difficult.

My party is level fourteen, with my main as a magus (Eld Sci 6/ Drg Dis 4/ Eld Kni 4), then Sosiel, Greybor, Aru, Daeran, and Nenio.

No one is focused on dispel, which seems to be almost a requirement here. PD has an AC in the 60s, no way my melee people are hitting without truestrike, and it's immune to magic missle plus virtually any save or die type spell (saves between 32 to 39). Add fast healing on to that, and I don't even see a route to wittle them down slowly.

Please send help; I've died, so, so many times at this point. Thanks for any feedback!