Corrupted Corpses in the Harbinger of Solaris boss fight

I sadly didn't remember to take a screenshot at the time.

Before the fight against the Harbinger of Solaris to aquire the sun orb, I accepted a mission from Catarina to look out for corrupted corpses. I didn't finish the mission before the fight though.

Entering the fight against the Harbinger, I was not only attacked by him, but also by a bunch of unique spiders, which after dying left behind green circles, enabling me to revive them and let them fight against the boss for me. I pretty much had to do nothing, the boss didnt stand a chance against 6 of them.

It seems like the spawn area of the corrupted corpses is not restricted to the non-Arena part of the Solaris Temple Level 2.


EDIT: Just went back to the boss room and it seems like one of the spiders died during the fight. Took a screenshot of at least that. Also took one of Catarinas positioning.