Giant Steppe is a large field of extremely tall grass (~2.5 meters) south of Santa Ignucia.
The grass is observed fireproof after many thunderstorms and wildfires in the surrounding area, leading observers to believe it to have grown over the graves of ancient fire giants.
Now, of course ancient fire giants aren't real and are just something you tell kids to make them behave around the Skromft festival, so it's likely just a quirk of natural selection that causes this.
Either way, there must be interesting animals hiding in the grass that no one's discovered yet. The ecosystem is entirely unobserved through the tall grass; perhaps you'd be able to make profound discoveries and cool potions with what you find.