The killing began the moment they reached the lower levels.
A heavily armored Lu Ping'an took the lead (mainly because he found his teammates too incompetent) and plunged into the horde of monsters.
Once the low-cost Triple Flaming Strike was unleashed, it meant the end for all enemies on a battlefield of this level.
At this point, Lu Ping'an had no intention of holding back.
Flames swirled around him, turning nearby Magic Monsters into charred corpses and easily bursting through the beast swarm that blocked their path.
But this did not mean that the "invaders" had the upper hand... After the passages between the upper and lower levels were cut off, outside reinforcements couldn't enter. The adventurers trapped in the underground palace had become fish in a barrel.
No matter how strong you are, once you lose your supplies and backup, all the enemy needs to do is to wear you down until you collapse.
"...Are there no Wisdom Demons?"