Flame Leviathan Hard Mode - What is it?

[zsuper]

Topic.
What is Flame Leviathan hard mode?

Our guild ran two 10 mans.
The first (mine) left all four towers up and engaged him, he had no buffs or extra abilities.
The second left all four towers up and engaged him, he had all four hard modes. They killed the towers and he had no hard modes.

So, any idea how to control whether or not we engage him with hard modes?

[EndGame]

I believe you have to talk to someone to activate hard mode.

Once it is activated; the towers provide abilities. Could be wrong though.