Well, don't try fighting in one of the two little 2nd floor cubbies on the left or right inside the building where two PHs are. You will agro stuff outside and the entire place will train you.
I found behind the castle on the ramp is a good spot to clear PHs. Once you get a siren muse (the spawner mob), then getting Octave out of the center of the castle is another story. You'll have to clear 4-6 mobs before pulling her, unless you can use calm or FD/fade pulling.
Edited, May 13th 2024 9:17am by rahzel44