from https://forum-en.gw2archive.eu/forum/info/updates/Game-Update-Notes-April-15-2014/
“Modniir Ulgoth
The Modniir Ulgoth will immediately appear near the War King’s Greatcamp once the boss is activated to rally his forces.
The Ulgoth is protected by his elemental magikitteni the Seraph advance their forces up to the Greatcamp and force the Ulgoth into battle.”