Dead thorn bastion

Bramble bastion: five thorn stems twisting into a trunk 5 m thick that ends in a crown of spikes at 15 m, a ring platform 13 m across at the wall-walk height (7 m) with a thorn guard, open where the ramp and two wall runs arrive. Dry grey dead bramble, brittle and thorny.

13.34 × 13.39 × 18.67 m