You are a Humanoid.

You are Medium or Small. You choose the size when you select this race.

Your walking speed is 30 feet.

You can see in dim light within 60 feet of you as if it were bright light and in darkness as if it were dim light. You discern colors in that darkness only as shades of gray.

You can hold your breath indefinitely while you’re not incapacitated.

You are resistant to fire damage.

You’re acclimated to high altitudes, including elevations above 20,000 feet. You’re also naturally adapted to smoke and other noxious fumes, and suffer no harmful effects from them. 

You know the poison spray cantrip. When you cast it, it manifests as billowing smoke and ashes.  Starting at 3rd level, you can cast the feather fall spell with this trait, without requiring a material component. Starting at 5th level, you can also cast the heat metal spell with this trait, without requiring a material component. Once you cast feather fall or heat metal with this trait, you can’t cast that spell with it again until you finish a long rest. You can also cast either of those spells using any spell slots you have of the appropriate level.

Intelligence, Wisdom, or Charisma is your spellcasting ability for these spells when you cast them with this trait (choose when you select this race).