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Veteran Skitarii gain Skirmish Optimisation, which says "Each time an Advance roll is made for this unit, roll one additional D6 and discard one of the dice". The Invocation of Machine Vengeance Canticle, which Mars Skitarii have access to, says "each time an Advance or a charge roll is made for this unit, roll one additional D6 and discard the lowest result". Say I use both of these at the same time and roll a 6, 6, and 1. Can I discard the 1, since it meets the requirements of being one of the dice and the lowest result and thus advance 12", or do I have to discard 2 of the dice?

No, you've only discarded one dice. You have to discard two, one for each rule

That seems to be the obvious and sensible interpretation, but can you elaborate on how discarding the 1 doesn't meet the requirements of both rules? I would have discarded one of the dice, and it also happens to be the lowest. Sorry if I'm being dense here. Maybe my mistake is applying both at once and rolling three dice at once when what's actually happening is rolling two rounds of two dice and discarding one at each stage?

You have two rules saying roll an extra dice and discard one.

Standard Advance is 1D6.
Add your first rule to get to roll 2D6, discard 1.
Add second rule to get to roll 3D6, discard 2 (lowest plus one other).

If you roll 2 extra but discard only 1 you haven’t met all conditions of both rules.

Private Jenkins wrote:
That seems to be the obvious and sensible interpretation, but can you elaborate on how discarding the 1 doesn't meet the requirements of both rules? I would have discarded one of the dice, and it also happens to be the lowest. Sorry if I'm being dense here. Maybe my mistake is applying both at once and rolling three dice at once when what's actually happening is rolling two rounds of two dice and discarding one at each stage?

Process rule one, to completion. That tells you to discard one dice. Do so
You now have two
Process the second rule, which is the only way you get to discard any dice, and now you have one.

Thanks guys!

What if i roll three 4s ? I would discard one 4 for skirmish optimisation, and then there is no lowest dice for machine vengeance, both are equal.

You resolve synchronous effects sequentially

So how it works is I apply effect a

I roll an additional d6 I have two 4's I discard 1 the lowest is a 4 so one dice goes

This leaves me a 4 I apply the second effect roll a 4 I have two 4's I discard 1 the lowest is a 4 so one dice goes

I'm left with a 4

By definition if the value of each die is equal both dice are tied for the lowest value in the pool it makes no difference which you discard your just being contrarian psfreak again

Agree. If all 4s then the lowest value is 4, so discard one of those. Yet another non-problem from p5freak.

 p5freak wrote:
What if i roll three 4s ? I would discard one 4 for skirmish optimisation, and then there is no lowest dice for machine vengeance, both are equal.

Yes, there is a lowest. And a highest. 4 is the lowest value of the set {4,4} and is also the highest value of that set.

A non issue.