Just once.
Achilles' Heel, and any procs for that matter are only checked once per power activation, and every 10 seconds on pseudo-pet powers(Sleet and Burn for example) or Toggle powers(Blazing Aura and Radiation Infection for example).
Mains (Freedom) @Auroxis
Auroxis - Emp/Rad/Power Defender Pylon Video Soloing an AV
Pelvic Thunder - SS/Elec/Mu Brute
Sorajin - Elec/Nin Stalker
Neuropain - Sonic/Mental/Elec Blaster
Also, Achilles' Heel debuffs don't stack so I'd generally just use one in AoEs and a couple single target powers you use often. The minimal gain from putting one in a snipe doesn't seem worth it to me since you generally just snipe once at the start of a fight and whatever you hit with it is probably going to be dead or near dead anyway unless it's a boss or higher (in which case you still aren't likely to be sniping it more than once).
Cascade, level 50 Blaster (NRG/NRG since before it was cool)
Mechmeister, level 50 Bots / Traps MM
FAR too many non-50 alts to name
[u]Arcs[u]
The Scavenger Hunt: 187076
The Instant Lair Delivery Service: 206636
Good point about not putting it in snipe. Yeah, i'll drop it in my three AoEs then, thanks.
Heel.
If we are to die, let us die like men. -- Patrick Cleburne
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The rule is that they must be loved. --Jayne Fynes-Clinton, Death of an Abandoned Dog
If Achilles had a heal he wouldn't have been nearly as famous for his heel.
Achilles was probably Invuln. He should have had a heal. If he skipped Dull Pain, that's his own damn fault.
@Roderick
I want to add some Achilles Heal -Res Procs. I was thinking of putting the first one in my Snipe. I am on a Rad, so the snipe is odd, damage over time. My question is: since the Snipe is a weird damage over time hitter, does the proc have a chance of firing on each tic? Can it fire on the first tic, and will that affect the rest of the damage?