Editing Warhammer 40,000/Tactics/Questoris Knight Crusade (30k) (section)

===Questoris Knight Errant===
Very similar to the Paladin, though with a Thermal Cannon which is S9 AP1 for chewing up Terminators & Land Raiders. For all other tasks look to the Paladin instead.

The shorter range means that it's going to be much closer to the center of the table where it will inevitably start taking your opponent's heavy weapons fire and is also more likely to get drawn into close combat. So it is a good option for a Seneschal/Lord Scion to give him more stamina against enemy heavy weapons and better odds in melee. 

Either that or use it as a flanking Aucteller (to benefit from its good chances of killing things in one-shot) or Dolorous (since it's going to be close anyway) and stalk up one side of your opponent's battle line looking for good targets.

Like the Paladin, you can buy Occular Augmetics & Bio-Corrosive rounds.