The Forge Master in the Blade of Demon Slayer

Traveling through the world of the Blade of Ghost Slayer, but becoming a swordsman?
"Then I must create the strongest sun blade!"
Hammer the iron ingot, but there is a prompt...

【Impurities-1】
Hundreds of refining into steel, but there is a reminder...
【Physical +1】
Forged into a weapon, but there is a reminder...
[Current weapon sharpness level 1]
[Forger: Strength +10, Constitution +10, Agility +10, Speed ​​+10]
[Get the reward: Breath of the Sun! 】
"Or... I'll still be the strongest swordsman, right?"