>>96456563
>What makes Sisters so overpowered in CA books specifically? That's the army I'm looking at, I just want to avoid the worst WAAC stuff
The new style of Acts of Faith and the bonuses it game (Witch Hunters toned them down a LOT), plus the ability to make a command squad in a 10-man transport with a Priest, a Canoness, and SIX squaddie models with full armory/wargear access. The second game we tried out a unit of Chosen of Khorne were sprinting around the battlefield screaming like little girls while the Sisters chased them to the dulcet strains of the Imperial hymn "Yakkity Sax", after violently raping multiple squads of Berzerkers in the first three turns. If you had a Repressor (I converted one) that goes up to 12 models. There's a reason there are so many restrictions on wargear in the WH dex and the CA one is very much why.
CA is also when we finally got the Exorcist and the Multimelta Immolator, which were extremely useful now that you could move and fire the main guns on a tank. So you could Tank Shock the corner of a unit, park the tank in a way that forced them to bunch up, pop the hatch and drop a heavy flamer and regular flamer shot from the passengers, plus whatever was in the turret. It made for some.. interesting games, let's put it that way. Partly balanced in that the only usable long-range anti-tank in the entire army was Superkrak missiles and the Exorcists, which were of course Public Enemy #1.

>>96453587
>>96458085
There are actually grog-era rules for Frateris. Before the White Dwarf article came out, a lot of us Sisters players used the Hive Gang Militia from the Armageddon codex. The Chapter Approved (2002) version has FM as "Redemptionists" that effectively use the same rules with a tweak for underbarrel flamers. For the Witch Hunters 'dex there was a White Dwarf article with Frateris as well as the option for Inquisitorial Guard and Stormtroopers.