Nineteen

Nineteen ("Grob'geb" in The Pencil Language or Nedak in Future English) is the last verse in the Eleven Chain, and can only be reached through very advanced warping as exiting Eighteen is nigh impossible.

Structure
Nineteen can be classed as a semi-void due to the literal absence of any form of real material except for 19 Eighteens floating around. These Eighteens are spread unimaginably far away from each other, and have never collided due to this.

Outside of Nineteen
Nineteen is the end of the Eleven Chain and the biggest number verse there can be. Due to the Number Chains being isolated from the rest of the hierarchy, Nineteen is not really contained by any verse. However, many copies of the Nineteen are contained inside hierarchy verses such as The Orbiting.