Balrog Boss quests

Wow. Good thing I finished Manji's Gladius quest like last year. (It was really screwed. I did the quest to obtain the Skull Earrings, but after all my trouble, i just had to click the Hero's Gladius option by accident. I was like WTHHHHHH when i did that. After that, i just bought one )

Hmm. These quests give a lot of EXP for a level 50 quest. Not that a level 50 char would be able to defeat Jr Balrog, much less the Balrog Boss...

Another question. Does the Balrog Boss work like Zakum? As in, u go into the room, summon it by hitting/dropping something, then it spawns? Or is it a boss where u have to wait for it to spawn?

I think the best guess is similar to HT as Isaac pointed out the reactor that looks like a gem is also on the boss. So you probably hit it a few times, then it summons.