It's not a special rule per se its a simple note in the units Notes-section.
BTW the Plaguereaper has the same critical as the Brass Scorpion in the RedCorsairsV3.9 list with the addition that Nurgle units don't take hits.

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Hmmm.

Tell you what, I'll accept CC4+ if you accept a normal critical

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Actually i find the critical very fluffy for a daemonengine which REALLY wants to kill its enemies
Both the Brass Scorpion and the Tower of Skulls have the +2 on the Catastophic Damage table which results on an Explosion on a 2+.
Both the Plaguereaper and the Plaguetower always explode even if they roll only a Destroyed result.

To me both read as an auto-critical if reduced to DC0.

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Sure, but I don't see that as important enough to break with convention. No official unit have automatic criticals, or even criticals on anything other than a 6. Epic has a very different criticals system to 40k, and I don't think a direct transfer is a good idea.

Well, it's hardly a major point; we've got the main stats agreed seemingly.

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Seems so  
So what is the view of others about the critical?

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Ok some stat ideas for the (Greater) Silver Tower of Tzeentch and the Subjugator Titan.

(Greater) Silver Tower of Tzeentch
Type Speed Armour CloseCombat Firefight
War Engine 15cm 5+ 6+ 4+
Weapon Range Firepower Notes
Beam of Power 45cm MW3+ Titan Killer
Bolts of Change 15cm D3 x AT5+

Damage Capacity 2. Critical Hit Effect: The Silver Towers  reactor explodes. The  Silver Tower  is destroyed and any units within 5cm of the model suffer a hit on a D6 roll of 6.
Notes: Invulnerable Save, Fearless, Reinforced Armour, Skimmer.

Slaanesh Subjugator
Type Speed Armour CloseCombat Firefight
War Engine 30cm 4+ 4+ 4+
Weapon Range Firepower Notes
2 x Tormentor Cannons 45cm AP4+/AT4+ Disrupt
Twin Blastmaster 30cm AP3+/AT5+ Disrupt
Subjugator Doom Siren 15cm AP4+ Ignore Cover
Hell Slicers (base contact) Assault Weapon Macro-weapon, Extra Attacks (+2)

Damage Capacity 3. Critical Hit Effect: The Subjugator is caught off-balance and staggers. Move it D6cm in a random direction. If this move takes the Subjugator into impassable terrain or another unit it can’t move over then it stops when it contacts the obstruction and suffers an extra point of damage. If it staggers into or over any units then they will take a hit on a D6 roll of 6+ (make saving throws for the unit normally).
Notes: Invulnerable Save, Fearless, Walker. May step over units and impassable or dangerous terrain that is lower than the Titan’s knees and up to 2cm wide.

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What is wrong with the existing Subjagator stats in the LatD?

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It was made before the Apocalypse datasheet  

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Which is no reason at all to change it - the unit is still broadly the same in use. I don't think we should blindly follow 40k let alone apocalypse

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If it wasn't a reson i wouldn't have come up with my own stats.
But i guess i couls subly alter thename so thatit is clearthat it isn't the Subjugator from the LatD armylist. I changed the name of the Silver Tower too but didn't came up for a new one for the Subjugator. What about Subjugator Grant Knight? IIRC the Slaanesh Scout-Titans and Slaanesh Knights all came from the Traitor Knight Household Diedne.

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Why do we need a set of alternative stats trying to mirror apoclaypse?

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Why do we play wargames instead of doing something more productive?
Because we enjoy it more.

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So because we can?

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Too.
And because Epic isn't the game which brings new units for Wh40k anymore. It's now the other way round.

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I would base it off the L&TD Subjugator stats.

However, I am under the impression that the L&TD Subjugator is over-strong?



EDIT:
Definitely go with 'normal' criticals for the Brass Scorpion.

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