Absolute Zero
The scene where Ryan made ice crystals go kaboom repeated several times. In the end, they even called the Frozen Whisperers to help, but they never found him. Moreover, whisperers were killed in droves by the combat machines. When Ryan killed the one-hundredth boss, he couldn't help but frown since the monsters didn't change their behavior even a little bit… they were still guarding the dungeon entrance. Still, at least they were smart enough to correct their position in order to cover the holes created by Ryan's attacks.
"This is odd…" Ryan rubbed his chin thoughtfully. "They are smart enough to control the minions and even to correct their positions, so why don't they use some tactic to get rid of me or at least slow me down a little bit?"
"You shouldn't expect that all monsters can cause you problems," Femradiel said. "They are inorganic creatures, so their level of intelligence is limited."