End City/Structure/Large Tower

A Large Tower is three times the diameter of the smaller towers and consist of a treacherous double spiral staircase made of purpur slabs and end rods, as well as housing two shulkers.
==== Materials ====
Name	Total	Stack
 	12 	
 	136 	2 + 8 Blocks
 	256 	4
 	11 	
 	12 	
==== Blueprint ====
All of these stairs are upside-down