Aftermath
After Lucan quickly closed the portal, he used ethereal sight to peer into the ethereal realm. Even though, only a moment passed, he couldn't find any trace of the shadow elemental boss. The assassin class boss was nowhere to be seen.
Lucan sighed, he hoped that he would be able to turn the tables in this fight, but unfortunately his only path to success was to throw away the boss. He felt regretful that he wouldn't be able to get his hands on any of that precious loot, but their was nothing else he could do.
After the boss was cast into a different realm, the elementals remaining inside the fortress descended into chaos. Some ran away, while others continued to fight, but none of the elementals were working together.