a Harvester from the movie "The Deaths Of Ian Stone", a Harvester is a demonic/vampiric form of shadow that feeds off fear but has acquired the skill to feed of pain.the idea i had is to make a player type that makes the player put off a shadowy smoke that is pure black...and every time it harms another player/bot it heals the amount of pain it caused...and its life slowly decreases...1 damage per 10 seconds maybe?so its forced to kill to live[K2L :D]
example
*shoots a player twice and causes 50 total damage*
*heals himself for 50 health*
*kills a player*
*fully healed* :D
another example
http://www.kongregate.com/games/urbansquall/bloody-fun-day(kill red things and you gain health on this game)
Other players who think this would be epic[say so if you do]
Sword99
Joe205
Thorax(thanks to the idea of losing health a bit so it HAS to kill/heal)