/idgames archive link to Irkalla
Created by Stormwalker (of Flashback to Hell fame!), with maps by @SuperCupcakeTactics, @Peerdolius and myself, this 11-map set is a pseudo-reimagining of Doom I Episode 3: Inferno, except in Doom II and using Boom features and expanded limits. It should work in anything that can handle the equivalent of complevel-9. Expectations may be subverted, and there should be some surprises along the way! Here's a map list...
Map 01: Dark Fortress