I think this datasheet would be a great potential addition to the Grey Knights roster. Its essentially GK-flavored centurions that are more expensive than regular SM centurion devastators due to our army rule. I also changed the psilencer from Sustained 1 to Devastating wounds.

Datasheet:

• Move 4"
• Toughness 7
• Sv 2
• Wounds 4
• Leadership 6
• OC 1

205pts for 3 410pts for 6

Twin Gatling Psilencers:

• 24"
• A12
• BS3
• S6
• AP0
• D1
• twin-linked
• devastating wounds
• Psychic

Twin Heavy Incinerators:

• 18"
• A 2D6
• N/A
• S6
• AP-1
• D1
• twin-linked
• ignores cover

Twin Heavy Psycannons

• 24"
• A6
• BS3
• S10
• AP-2
• 3D
• twin-linked
• ignores cover
• Psychic

Centurion Purgator Fists

• 3A
• WS4
• S5
• AP-1
• D2

Abilities: Sanctified Kill Zone

• Each time a model in this unit makes a ranged attack, re-roll a Hit roll of 1. If the target of that attack is an enemy unit within range of an objective marker, you can re-roll the Hit roll instead.