You agree to go with Moonflower. With the cart's traces in place, you grab onto Moonflower's tail.

Moonflower: "Choo choo‼"

Moonflower begins to guide you through the darkness.

Moonflower: "Careful, s'a bit of a slope down here. So, did ya come here to mine for gems?"

You tell Moonflower that you did.

Moonflower: "Y'know, they say these tunnels were dug by grootslangs a super long time ago."

You ask Moonflower about grootslangs.

Moonflower: "They're big meanies who really like gems. There's not a lot o' those around here, so it's mostly safe.

I think the tunnels that go north to the Heart of the Everfree got more valuable stuff in 'em, but I also heard that's where all the monsters went, so I wouldn't risk it!"