Achilles' Heel -Res Stacking

I am pretty sure (99.999%) the proc can't stack at all from the same alt.

But, can it stack from different alts? IE, if a team of 4 debuffers are all slotting the proc in one or more of their powers, is it sorta like the stacking from Interface debuffs where a team that all has the same one reaches a point of diminishing returns (or no return).

And as a permutation on the above, if an Achilles' is slotted in a pet power, and the pet summoner also has achilles' in another power, would the pet's Achilles' potentially stack with the summoner's? Would pseudo-pets behave the same as true pets in the regard, too?

The Achilles proc does not stack, even from different casters.

I was sorta expecting that, but thanks for the clarification. So a small team that each had it the best result the could hope for is to get it close to seamless always up. OK, thanks.

The proc actually applies an autopower that makes the target debuff itself. That power is flagged "Doesn't stack from same caster", so no single target can ever get more than one debuff at a time.

There's two ways that this could be applied, though. One is like the shields from Force Field, Thermal, etc, where reapplying it extends the duration. The other is like the buff from the Force Feedback proc, where the effect prevents a second stack from applying.

In the former case, it's theoretically possible to keep the effect stacked permanently. In the latter, there must be small gaps, since the power has to wear off before it can be reapplied. I'm uncertain which method Achilles' Heel uses.

Note that the Fury of the Gladiator proc (PVP PBAoE set) and tanker's Bruising (secondary effect in tanker T1 attacks) function the same way as the AH proc, except that Bruising has a 100% proc rate. Each effect has a different name though, so you can stack up to one of each on a target. You can never have more than one of each though, no matter how many sources are applying the debuffs.

Thank you very much Roderick. Very detailed and clear. Everything I could want to know, except for that one bit you don't know, and I'm not sure in the grand scheme how much difference that makes.

Thanks for taking the time to spell all that out.

Now I just need to decide how many Achilles' I feel are enough to get it out and in effect most of the time, and stop there, as more is basically a waste.

Every effect in the game has a probability associated with it. Most of the time, though, it's set to 100% (or, more accurately, 1.0).