![Image](http://ic.pics.livejournal.com/evilgrins/3189901/3113323/3113323_original.png)
It's a Ghost (file attached) and sadly it doesn't look like a guy with a blanket over its head. It flies, it can go through solid objects, and it basically goes around chasing people and draining their lifeforce.
The tricky thing is you can't shoot it. Anything less than a redeemer doesn't even phase the thing. All conventional ammo passes right through it like it was a... well, ghost.
![Image](http://ic.pics.livejournal.com/evilgrins/3189901/3113510/3113510_original.png)
It attacks players and bots but not other monsters.
So far, short of a redeemer, the only thing that seems to make it go away is if it doesn't drain someone's life for a few minutes it goes into a wall and disappears.