Yeah, you don't know how a LANTERN could be harmful, but you suppose you should be absolutely sure it's safe before taking it along with you and Five.
And as it turns out, it's very safe! Just a good old fashioned LANTERN.
You wonder who it belongs to?
Oh well, doesn't matter. It's yours now.
The LANTERN is lit by a small firefly. The firefly will die after 2 days, and if that happens you will have to find another fueling substitute.
Nino: Take that bad boy of a lantern. It's always better to see in the dark.
The LANTERN is now in your LEFT HAND. Your HEAL is set back to your inventory.
Five would probably feel safer with a light source around her now.
You proceed through the path, and this leads you into a new part of the FOREST area. The voices of wild animals fill the place...
The hollow, faint sound of a WOLF'S HOWLING can be heard.
Five clings to you for safety.
Nino, being a big-brain as per usual, can easily see how long fireflies have left to live for.
tl;dr: Nino gets paranoid over a lantern, but it turns out to be cool and uses it. Five is spooked by noises.
tl;dr: We learn that holding a lantern dims the entire world around you