The situation was immediately reported to the guards as well as the mercenaries. The presence of an un-named creature in a trial zone wasn't a matter mere participants could handle by themselves.
Everyone moved out to subjugate the monster, but there was a problem. Someone had messed around with the portal that led to the trial zone. The technicians were already on it, but for the life of God, they could not figure out why the portals were behaving weirdly.
Since the portals were the main way of travelling between the commanding zones, a broken portal meant that they could not even ask other commanders and monarchs for help. They were on their own in this fight.