Painkeep v3 - Blast your opponents with 3 times the Pain. Deathmatch mod - make other players "die." Disclaimer - this is a free product with no warranty - see disclaimer.txt for details. Number Six - welcome to the village.
Demo of the Ego, found in Painkeep and Archon, and how it is used
Ego originated as one of the 4 new "artefacts" in this release:
PainKeep Artifacts 1.3 - 03 Dec 1999 - Copyright (c)1999, 2000 Thing & Ergodic
The ego head orbits the player and when enemies shoot him it rushes forwards dealing damage to the enemies. It is capable of exploding close to the player and killing him. After 30 seconds if unused it goes away.