You've finally found Chairmain Nautius, for better or worse. Defeat him, then report to Ulla.
Step 1. Vanquish 'Research Center Chairman NautiusHead of research at the Idgel storage facility. He appears either as Berserk Chairman Nautius or as Frenzied Chairman Nautius. You must defeat the Beritra Army as fast as possible to catch him before he flees., whom you tracked down after a lot of work. (x1).
Step 2. Report the results to UllaAn Archon dispatched to Sillus Fortress in Katalam when Sillus Fortress is captured..