This is The last map of Heretic:Shadow Of The Serpent Riders. in Sploder Format.
Monsters:
Small Enemy: Gargoyle
Normal Enemy: Disciple/Ophidian
Guardian: NitroGolem
Blue Key Demon: Iron Lich
Red Key Demon: D'sparil
Secret Areas:
1:Open the wall before the battle versus D'sparil. This Contains a Atomic Power (Tome Of Power) and ExtraHelath (Quartz Flaks).