And eventually dinner winds down and and their hosts start putting things away.

"Time to go now?"

"Yes." He takes their hands.

And they go north.

It's very, very cold and snowy here, and there aren't any settlements or other terrain features at all.

This is about what they were expecting. He puts up a rope trick.

And they can all climb up, and she can snuggle Imrainai and go to sleep.

The rope trick fails nine hours later, and Mahdi puts up another one.

She can practice hand signs and reread Verita's adventurer's guide to the Underdark. She's honestly kind of unclear on whether you have to go through the Underdark to get to the gate, but might as well read it anyway.

They're also unclear on this! Lots to learn when they next teleport. 

"I think we should go invisible, just to be safe."

"You think there'll be anybody guarding it?"

"I don't know but it's not impossible. Or watching it."

Nod.

He casts Invisibility on Imrainai and Verita, Greater Invisibility on the three of them. 

He Teleports.

There's a cavern entrance rising out of the ice and snow. It doesn't particularly look like a gate, but it's the only thing around.

"Huh," says a Mahdi-like voice, as footprints circle it. 

"- perhaps we should have inferred this from the name "Deep Plane"."

"Going into the Underdark with a couple civilians is a real dumb plan."

"Yep."

"Awww, we're not gonna turn around, are we?"

"I'd certainly prefer not to," he says. "Maybe we can get you two stowed away safely and take a quick look to see if there happens to be a clear passage to the gate. But if there's not, then yes, we turn around. Feeling silly is better than being dead."

"I guess. Can always come back someday when I'm bigger."

"Yeah. I bet you'll be able to recruit intrigued companions, it's a great story."

"Rope Trick."

So she and Imrainai can climb up.

"Would you like us to go in and look for the gate? I think we can handle ourselves, but if we don't make it out, you'll freeze up here."

"I think you can handle yourselves."