Herian

Herian is a 32-level megawad for Doom II by Ian Wilson released in 1998. A sequel, Herian 2, was released the following year, featuring similar themes and features from the ZDoom source port.

Levels
Secret levels:
 * MAP01: Cage
 * MAP02: Airborne
 * MAP03: Garden
 * MAP04: Canyon
 * MAP05: Dungeon
 * MAP06: Fortress
 * MAP07: Theatre
 * MAP08: Doomtoo
 * MAP09: CityIsle
 * MAP10: Switchroom
 * MAP11: Castle
 * MAP12: Elevator
 * MAP13: Siameze
 * MAP14: Tank
 * MAP15: ROTT (exit to secret level MAP31)
 * MAP16: Hexed
 * MAP17: Spider
 * MAP18: Orange
 * MAP19: Cascade
 * MAP20: Warehouse
 * MAP21: Waterfall
 * MAP22: Vertigo
 * MAP23: Office
 * MAP24: Cyberden
 * MAP25: Quarry
 * MAP26: LastDuel
 * MAP27: Contours
 * MAP28: Junkyard
 * MAP29: Disco
 * MAP30: Big
 * MAP31: Vastland (exit to super secret level MAP32)
 * MAP32: Trubble