The thing is that they're playing Radicals, even the Grey Knight. Every PC seems to be having some issues withing, such as failing faith. Now, I don't have any issues with this but they just polished off a Herald of Slaanesh in one round - having 4 players with psychic abilities, as they are allowed to take Sorcery powers.
Fortunately, I have something of a greater challenge (esp to the psykers) and I'm not sure to spring it on them in the next session. I had planned for them to come into the story when they have done sufficient investigation. Unfortunately, they happen to be a big fan of 'Tell us/do as we say or we torture you', even after they frighten the plebs with psychic powers. Any suggestions on how to make the fight last longer than just one or two rounds, short of flinging untouchable extra tough & high damaging titans.
You're guy/girl is playing the Grey Knight radical? So, he's not doing what he's meant to be doing in killing everyone for even thinking about dabbling in sorcery? Grey Knights CANNOT. BE. RADICAL. it literally goes against everythingt hey are and everything they stand for. You must punish this player for his/her poor roleplaying skills by sending a squad of his order to murder everything in a 20 mile radius. If one of my players tried such cheek I'd ***** slap them so hard the handprint would never leave thier face.
The Grey Knight is not exactly a radical but more about having a slight faith issue / or with his order's creeds - one or the other (at least that's what he described his char). The players are, however, can be described as power players. I heard from one of my players (who's GM'ing in another game with the same players) that they took on 2 daemon princes and won, and they're not even Ascension-level.
In fact, the way they're playing, they tend to skip/ignore the less battle-side of the campaign ie. political, social aspects.