MAP01: Mansion Halls of Madness
Author: Muumi
Music: Lair of the Raven King by Muddy

MAP02: Deluge
Author: LordEntr0py
Music: "Wretched Harangue" by Dragonfly (Joshua o' Sullivan) and Lippeth

MAP03: Abandoned Before the Blast
Authors: Pegleg (Layout and most encounters) & ViolentBeetle (Texturing and some balancing)
Music: The Berggren-Malde Complex by Ivan Stanton & DCG Retrowave

MAP04: Blacksite
Author: DFF
MIDI: Stomping Grounds by Lee Jackson

MAP05: Underwood
Author: ViolentBeetle
Music: After the Storm by Stewboy

MAP06: Destined Decline
Author: WeirdSandwich
Music: Relic by Psyrus

MAP07: Glory Days
Author: ViolentBeetle
Music: Prelude to Msiri in B Minor by Jimmy

MAP08: Magma Flow
Author: Muumi
Music: Crawler by AD_79

MAP09: Where Fools Always Trespass
Author: Dac
Music: "Descent of Madness" by Tristan Clark

MAP10: The Bleeding
Author: myolden
Music: Aorta by Tristan Clark

MAP11: Astral Sanctuary
Author: Shawny
Music: Realm by Psychedelic eyeball

Intermission music: Endgame from Descent
Title music: Benevolent Gods by James Paddock, ft. Alfonzo

Evil book by BluePineapple72
Title pic and intermission screen by Muumi
Decorations are from Realm667, specifically by: Captain Toenail, Gothic, whirledtsar, JMAA, MagicWazard, Captain Toenail, Gez, ShadesMaster, Shtbag667
Additionally a sprite was made based of a scientist sprite from Ancient Aliens
Evil wizard is based off Hexen

Most of the textures originates from 32-in-24-15tex
It also uses textures posted on Doomworld by:
Doom_Dude; kwc; AconyX; Nootrac4571; Smouths; Scorpio; Blast_Brothers; CherryPoptartzzz; Chopblock223; Fredrik; 
Geodesic Dome Enthusiast; Chainie; Gez; brinks; Muumi; nue; XLightningStormL; Fuzzball; MattFright, Scypek2.
As well as some textures from:
NMN Corporation AKA Pawel Zarczynski; Toaplan; Duke Nukem 3D; Blood, Hereic, Hexen; RHFTex; Cagetex; Jimmytex.
Resources inside the wad have markers to help identify individual authors.