Destroyers of Ignas (also stylized as D.O.I.) is a mod for registered Wolfenstein, made by Über Wolf. It was released on November 6, 2004.
The mod features 8 levels, all on Episode 1. The original E1L8 remains though all guards bar one are now dead. New enemies are featured, Ignas, likely based on a real-life character, either as a tribute or as a jibe. Either way the tribute remains lost of those not in the know.
It was available in 4GL in addition to DOS, though not featuring any coding changes, and it is thus also playable in SDL.