After collecting all the necrologos pages, the boss, two hyppogryphs, appeared and swiftly killed me.
When i revived I came back to them and engaged them. However, they didn't aggro me this time. They sat there and let me wail into them.
My class was 29 archer. I was alone. The difficulty was set to 2 stars. I did try auto-attacking them to see if that'd wake them up, but it didn't.
Just letting you know~