Poison

Guna then thought, 'Rainbow Sword? Why is he calling me that?!', and then he heard a laugh from behind his back, and saw that Gen, had his hand on his stomach as he laughed.

Guna then said, "Hey, Gen! Why are you laughing?!"

And Gen said, "Hahaha, Guna, you have to agree that's a very funny name."

"... Didn't you say you needed time to prepare? Do you have time to be laughing like that? We're in the middle of a fight."

"Hahaha, that's right, I'll focus, hahaha."

"..."

Guna was about to scold Gen again, when he saw something in his peripheral vision, and then quickly used his aura to defend himself from an arrow that was coming towards him.

Right after that, a person appeared on his side attacking him with a sword that was on fire, and Guna could see that behind this person two more people were coming to attack him in sequence, one of them using a sword, and the other with a bell of some kind.