My bag wasn't even halfway full, and I had learned another skill. So, without any care, I dive inside the dungeon again.
The same scenery greeted me and I didn't waste my time. I start the stopwatch so I could see how much time it would take for me to clear this dungeon.
Without further ado, I began speedrunning this dungeon like in games.
First, I cast "electric ball" repeatedly and killed quite a few monsters. But it takes some time for them to die and it would take only one casting to kill one monster. Spamming the skill won't kill them faster, but it at least froze them on the spot, that helps me a lot.
After the electric ball became an annoyance, I cast hundreds of them around me and will automatically hit the enemy on sight. It's not automatic practically, I could just use my mana to manipulate them and attack the monster on spot.