[RPG] ny terrain option that would fit Avernus/the Nine Hells for the ranger’s Natural Explorer feature

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I'm reading through Descent into Avernus and my vision of it is a Mad Max-esque world. Red, desolate, almost like a desert but not classified as one. The mountains there have no vegetation… just more rocks.

For Ranger's Natural Explorer, and I play Adventurer's League so Rules as Written, would any terrain work in this environment? I feel like the most accurate description would be Tundra. But the closest option is Desert.

Best Answer

Avernus is a desert

The best descriptions of Avernus I've found are in the Baldur's Gate: Descent into Avernus adventure, under the "Paradise Lost" heading in the introduction (p. 9):

Before the Blood War reduced it to a blasted wasteland, Avernus was a honey trap created by Asmodeus, a paradise of infinite delights designed to lure and enrapture mortals.

And in Mordenkainen's Tome of Foes, under the "Lady of Ruin" section about Zariel's realm (p. 11):

Once it was a bustling realm filled with cities, trade outposts, and other features, but recent activity in the Blood War has reduced it to a blasted wasteland.

It is only described as a wasteland, that used to be lush and beautiful. Combined with its tendency for spontaneous mirages and the direct comparison to Mad Max, it's a desert.