Is Hallowed Conclave plus Argent Assault legal?

Yes. Hallowed Conclave costs 2 DP and Argent Assault costs 1 DP, which is exactly the 3 DP Strike Force budget at 2,000 points. Grey Knights carry no Unique Tags on any detachment, so there is no keyword restriction to check either. The only test in this faction is arithmetic.

Why do both detachment rules affect the same unit?

Because a Paladin Squad carries the TERMINATOR keyword. Hallowed Conclave's Duty Before All names GREY KNIGHTS TERMINATOR units, and Argent Assault's Dauntless Champions names PALADIN SQUAD. A Paladin Squad satisfies both, so it falls back and still shoots and charges, and it wounds tougher targets on a better roll. There are no conditions to reconcile between them.

What is the weakness of this pairing?

Mobility, shooting and scoring. Neither detachment makes anything faster, and Terminators walk. Between them there is one shooting stratagem. And neither rule helps you hold objectives, which makes Strike Squads load-bearing even though they benefit from neither detachment rule. If mobility worries you more, swap Argent Assault for Immaterial Interdiction; if shooting does, swap it for Fires of Purgation.

Which characters should I use in this pairing?

A Terminator character, because Argent Assault's enhancements are TERMINATOR model only and two of Hallowed Conclave's four are as well. A Grand Master or Grand Master Voldus works. Avoid planning around Kaldor Draigo or Brother-Captain Stern: both attach to Paladin Squads on their datasheets but both are Warhammer Legends and are not legal for matched play.

Hallowed Conclave + Argent Assault: The Best Grey Knights Pairing in 11th Edition

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Hallowed Conclave + Argent Assault: The Best Grey Knights Pairing in 11th Edition · SprueSentry

Hallowed Conclave + Argent Assault: The Best Grey Knights Pairing in 11th Edition

Why the two rules stack on one squad

The turn this pairing wants

What the pairing does not fix

A 2,000-point shape

Common questions

Is Hallowed Conclave plus Argent Assault legal?

Why do both detachment rules affect the same unit?

What is the weakness of this pairing?

Which characters should I use in this pairing?