Here's a couple of house rules I use, at request I am posting them:

Deadly

Reserved only for the most traumatic of weapons, Deadly weapons roll an additional +1d10 on the blessed occurance of a Righteous Fury. Recommended for Bolters and Chain Weapons

Piercing

Few weapons can equal the impaling nature of piercing weapons, Piercing weapons apply their penetration rating to a target's armour rating as well as their toughness bonus. Additionally, add their Penetration rating to damage when Righteous Fury is invoked. Recommended for Bolters, Mono and Power Weapons.

Scatter (Hope this doesn t open this can of worms again!!)

No fluff, just crunch: one extra hit per 2 dos at PB and short range, Primitive quality and a 50% reduction in range penalties at long and extreme ranges (-05/-15 instead of -10/-30). I am still waiting for an official revision to this weapon quality, but, as evident by its omission in the current rules revision, this version of Scatter as well as the previous two weapon qualities are relegated to my home brew.

whisperer in the vault said:

I'm confused...

...there is already a Scatter quality in my copy of Dark Heresy which uses pretty much exactly the same rules as the ones you wrote here.

What gets me is the Unstable weapon quality. I understand the rules for an Unstable weapon, but I can't find a weapon that uses it!

Oh you mean you don't have this in your copies of DH?

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Upgrades & Munitions:
Perpetual Pressure Regulator: Removes the Recharge Quality from a Steam Weapon while adding the Unstable Quality. Furthermore you must now add +2 to the weapon’s die roll on Table 5-6 Weapon Overheating (p.129 Core).

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There is the Volnox Thunderclap in the Inquisitor's Handbook p. 94-95 with Unreliable. That's the only offical instance I can think of though.

As to the original topic I like the idea of Piercing but would probly reserve the quality for a more specific class of weapons making ubiquetous mono-edged weapons Piercing could get very nasty very fast, although if in you games mono weapons are much rareer or you don't mind that extra lethalty then I think its good as is. Bolt weapons (as per many peoples house rules & now the most recent Eratta) are already Tearing so Piercing again might make them a bit more deadly but the same caevet as for the mono applies here as well. As to Deadly, well that's just that.

...there is already a Scatter quality in my copy of Dark Heresy which uses pretty much exactly the same rules as the ones you wrote here.

Actually, Scatter in RAW allows extra hits at PB and no bonus to hit at long or extreme range, my home rules are somewhat unrealistic (for example, the firer doesn t have to adjust the choke of the weapon) but were more of an attempt to make the shotgun a bit more useful IMHO of course

What gets me is the Unstable weapon quality. I understand the rules for an Unstable weapon, but I can't find a weapon that uses it!

Nor could I, but I do use the Unstable quality for Flame, Melta and Plasma weapons of poor craftmanship quality. As an extension of this philosophy, is suppose you could also apply the Unstable trait to any of the previously mentioned weapons to simulate subpar ammunition or weapon damage (perhaps the player had to use his flame pistol to parry a melee attack or you could have ruled the weapon was damaged because it was caught in a blast where Righteous Fury was invoked).

Wu Ming said:

Here's an update to the house rules I posted originally,

Deadly

Reserved only for the most traumatic of weapons, Deadly weapons roll an additional +1d10 on the blessed occurance of a Righteous Fury, whether the confirmation test is successfull or not. As is standard, all dice explode normally. Recommended for Bolters and Chain Weapons

Piercing

Few weapons can equal the impaling nature of piercing weapons, Piercing weapons apply their penetration rating to a target's armour rating as well as their toughness bonus. Additionally, add their Penetration rating to damage when Righteous Fury is successfully invoked. Recommended for Special Ammunition such as Kraken Penetrator Bolter Rounds and Eldar Crystal Weapons.

whisperer in the vault said:

My apologies, I need to clarify in that Deadly weapons roll an extra +1d10 whether the RF test succeeds or fails. This is in addition to the +1d10 granted by a successful RF, thus a failed RF test yields a +1d10 while a successful RF test grants a +2d10! All dice explode normally.

You use explosive dice!?

You use explosive dice!?

kjakan said:

Only on problem players!! Sorry, I did not want to use the term Righteous Fury too many times. Expanding dice didn't have the "oomph" factor, imho. Besides, explosive fits the setting to a tee. I believe I borrowed the term from the Legend of Five Rings or was it Shadowrun? Sorry I forgot but either game is an excellent source for material (especially social interaction, the former and cibernetics for the latter).