Screamerstar

The Screamerstar is a Warhammer 40,000 tactic using Chaos Daemons. It is made of rerollable 2++ and FUUUU-. When used right it can be a devastating move (and a major annoyance) to the enemy player, but will quickly lose you friends.

How to Lose Friends and cause Heart Attacks

Basically you take some heralds of Tzeentch on discs, roll on divination and try to get forewarning, as well as taking the Grimoire of True Names and preferably Fateweaver for his rerolls. Once you have a herald with forewarning you cast it on a unit of Screamers (usually 6-9) and grant them a 4+ invulnerable save. The grimoire then brings it up to a 2++. Since they are Tzeentch units they reroll saving throws of 1, giving you a crazy death star that can only be killed by convoluted or rare means. Keep in mind the herald on the disc can still be killed, so remember to roll for Look Out Sir! for those precision shots and do not keep him in the front of the unit.

Counters

There are a couple of ways to lessen the effectiveness of this unit. The weakest one is to use something that forces rerolls of successful invulnerable saves; as a die can only be re-rolled once, it makes a slight dent in the unit's effectiveness, although not by much. The second method is to bring Strength D weapons, from Lords of War or an allied Knight allied detachment's melee, drowning out his cheese with your own. The third, optimal way is to grab your opponent and beat his brains into paste for being a cheese-mongering cunt.