The fight became a little bit harder with two Vileshrooms at the same time along with the boss. It even became chaotic.
The group had to split their attention between 3 different monsters, and none of them had a good understanding of leadership to know how to handle a group of fighters. The Swordsman who was the leader was just there as a figurehead of the party. He was never used to leading.
Even Ning had to never do this sort of thing. He was always a solo fighter, and as a result the fight became hard to handle.
They would deal with the Vileshrooms, but then the Shroom King would attack them. They would fight the Shroom King, but then they would be hit by the Vileshroom's Seed Bullet.
In the end, whether he could or not, Ning had to stand up and give them orders.
He told the Swordsman, fire mage, and ranger to take away the last 20% of the Shroom King's health. As for the two Vileshroom, he and the assassin would handle it themselves.