I had completely forgotten about the necessary items needed for
exploring a cave and panicked when I said it. Eugeo nodded with an
expression indicating to leave it to him, and raised a piece of grass that
even I didn’t know when he had picked up. What are you going to do
with a bristlegrass? Just when I looked forward in a dumbstruck
manner, Eugeo said with a serious expression.

“システム・コール！ リット・スモール・ロッド！”
S y s t e m  C a l l  L i t  S m a l l  R o d

«System Call»? Just when I was startled—

The tip of the grass Eugeo grabbed onto let out a bluish-white
light with a *swoosh*, and the brightness was enough to illuminate
several meters of darkness. Eugeo raised it and stepped into the cave.

(Alicization Beginning, 296)