BWbear

After crossing over into a world of magic, Dean Bruce was mistaken for a powerful sorcerer. Though he initially intended to sternly refuse the beautiful woman’s request to become her mentor, she offered him far too much to say no!
Completely clueless about magic, Dean Bruce had no choice but to make up spells on the spot. However, when he saw the astonishing power unleashed by the beautiful woman after chanting his random incantations, he was stunned.
The spells he had carelessly invented… could they really comprehend magic and even forbidden spells?
As Dean Bruce ascended to the pinnacle of magical prowess and became the Archmage, he candidly answered a reporter's question during an interview with the Alliance: "I never understood magic. I just made up a few incantations, that's all."
People were in awe of him—this, they believed, was the true humility of a Grand Archmage!

I Made Up Forbidden Spells, and They Actually Worked?

Seeing the Black Turtle seething with rage, yet too hesitant to attack, Dean Bruce quickly assessed the situation.

His mana was running low, and the spells he had taught others were primarily defensive and supportive in nature. He lacked the power to outright kill the Black Turtle. However, by prolonging the standoff and leveraging the unique properties of Blood for Blood and Wind, Forest, Fire, and Mountain, he was confident he could extract even more Red Sun Fruits from the beast.

The standoff also gave him time to better understand the rewards he had received. After all, he had only just acquired Wind, Forest, Fire, and Mountain and wasn't yet adept at using it to its full potential.

If the Wind and Fire components of the spell possessed offensive capabilities or special effects, he might even have a chance to defeat the Black Turtle and claim the Red Sun Sacred Tree!

Chapter 43: Another Draw, Seizing the Red Sun Fruits!