The skill I needed was available from one of the dryders, so I had to get inside, and then past the hydras and flesh golems through the crippling, burning lava, then go around killing all the dryders and their bosses. And this with henchmen.
I did this, and I killed them all, but the mesmer boss didn't spawn, however there were lots of bosses there.. So I restarted and did it again, and NONE of the bosses spawned! How can that be? The whole area was devoid of bosses. Is this some kind of anti-skill-capping mechanism that kicks in when you go to the same area too much? Or was I just incredibly unlucky (or lucky, depending on how you look at it).
