Zaero: Episode 1

Zaero: Episode 1 is a three-level PWAD for Doom II, released in June 2005 by Steven Searle. Built for the ZDoom source port, Zaero is heavily inspired by  and features a similar aesthetic, with the gameplay enhancements being reinforced by the addition of several custom enemies through DECORATE. Planned to be the first entry with more maps to come, no sequel ever materialized.

Zaero: Episode 1 was included in the Top 25 Missed Cacowards.

Custom monsters
The WAD includes six new enemies defined through the DECORATE lump:
 * Afrit:A floating baron of Hell engulfed in red flames, the Afrit can shoot different types of projectiles. It has 950 hit points (thing type 3120).
 * Zombie marine:A zombiefied, helmeted marine carrying an assault rifle. It has 100 hit points (type 3200).
 * Cacolich:A pale, tan-colored cacodemon-like enemy, which can shoot fireballs from its eye, as well as flames from its mouth. Has 500 hit points, and comes in a stronger (type 3131) and weaker (type 3132) variant.
 * Rocket zombie:A type of former human with a shoulder-mounted rocket launcher. It has 50 hit points (type 3202).

Soundtrack

 * MAP01: "Pressure Point" by, originally from 
 * MAP02: "Stealth Frag" by Sonic Mayhem, from Quake II
 * MAP03: "Rage" by Sonic Mayhem, from Quake II
 * Title screen:
 * Intermission screen:

Trivia
Zaero is the name of an unofficial expansion pack for Quake II featuring brand new levels, weapons and enemies. The name of the expansion pack was an inspiration for the WAD.