Abel finally felt like a real wizard after casting the powerful firewall. He was no longer dashing into groups of hell creatures with a knight sword and putting his life at risk.
Using a knight sword was still a reasonable fighting style in the Rogue Encampment, but he could no longer do so after arriving at Lut Gholein.
Most of the hell creatures in Lut Gholein could use elemental attacks, which were a lot stronger than physical attacks.
He quickly explored the first level of the maggot lair with his new spells. With the spirit guardian knights blocking the attacks upfront, Abel could keep unleashing powerful spells from behind and wipe out those hell creatures with ease.
In the past, it would have taken Abel at least 10 days to explore the maze-like lair fully, even if he was lucky enough to find the entrance quickly.