In Obadiah 18, what will the house of Esau be when Jacob sets it ablaze?

Answer: Stubble

The house of Jacob will be a fire and the house of Joseph a flame, but the house of Esau will be stubble, consumed with no survivor.

“Then the house of Jacob will be a blazing fire, and the house of Joseph a burning flame; but the house of Esau will be stubble—Jacob will set it ablaze and consume it. Therefore no survivor will remain from the house of Esau.” For the LORD has spoken.”— Obadiah 1:18 (BSB)