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Was playing a unit of 3 Centurion devastators joined by Tigurius. Tigurius had his Storm of Fire warlord trait. Centurion Devs shooting at a flyer. Of course they need snap shot 6s to hit the flyer. What happens with grav weapons on the 'to wound' roll with the Rending on 6s from Tigurius? dsf

I don't think there's any RAW to cover this, since Grav has no Strength Value.

HIWPI, though, is that nothing special happens. No point giving rending to an AP2 weapon that lacks a Strength Value.

Nothing, grav doesn't work the same way as weapons with a strength value.

Grav still rolls to-wound, just instead of the normal S vs T method it uses armour saves.

Arent grav weapons all ap2 anyway?
And its never an armour pen roll so that also doesnt matter, right?

Nothing special. Grav works differently against vehicles, simply causing immobilize results on 6's. Against an fmc, you're already ap2, so rending is redundant there.

It could possibly help out the hurricane bolters or missile launchers though.