Chaos Spawn
Chaos Spa-, ahem, the unit in question are considered my many to be the worst unit in the Chaos Space Marines codex and, possibly, the entire game of 40k. They are so bad, in fact, that to even utter their name causes a horrid mutation turning you into a Chaos Spawn yourself. Wait! No! I didn't mean it- *OHSWEETJESUSMOTHEROFGODNOOOOOOOOOOOOOOOOOOOO!!*
Ahem... Continuing where my predecessor left off, you-know-whats should only be refer to as you-know-whats. That or they-who-shall-not-be-named.
Only Failaddon can comprehend how goddamn useless these things are.
Gameplay
You-know-whats are horrible in-game. Coming in at a whopping forty points (That's almost three normal CSMs) they wander around the board aimlessly with a throw of the Scatter Dice, move D6, have the Rage special rule and die to Bolter fire earning your opponent a free kill point. They fucking suck, essentially.