Mischievous Little Bombardiers 

In a place where the adults weren't looking, several baby Slimes huddled together.

Eiko looked at her friends with a smile as she took out several red Beast Cores from her storage bag.

Fei Fei, Cora, Nora, and Cedie looked at the cores in front of them with curious gazes.

"This?" Fei Fei asked as she looked at the Beast Cores that Eiko wanted to give them.

"Boom Boom!" Eiko replied with a mischievous smile.

"Boom?" Cora asked.

"Boom Boom?" Nora tilted her head.

"Boom…" Cedie blinked in confusion.

Eiko nodded. "Boom Boom Boom!"

While their Guild Headquarters was under construction, Eiko spent her time playing with the Bomb Lover, Glee.

The two hit it off right away because Eiko had also developed a fondness for things that exploded. As if finding her soulmate, Glee decided to share dozens of Beast Cores with Eiko, which were all from the same Monster.

The name of the Monster was the Bombardier Gorilla.