I understand that deadly poison 4 and 5 will occupy different debuff slots on mobs. However, say you have (5) rogues, all with deadly 5, but each with a different level of vile poisons (increases damage by poisons) ... will each rank of vile force a new debuff?

I'd also like to add forgive me in advance, my long weekend starts in 10 minutes.

EDIT: Hah, I spelled vile wrong twice.

Funny you'd bring that up, because (assuming the same rank) a lesser-geared priest with a 3/3 improved renew will overwrite the renew of a better geared priest with an untalented renew that ticks for more.

To add insult to injury, the latter priest will get the "a more powerful spell is already active" error if he tries to overwrite the lesser renew.

Interesting.

OK, then I'd assume that the stack would be the highest talented rogue's. Now, the question is: would other rogues' poison increase the stack, or not apply at all?

I think if the damage done by the talented rogue's single application of the DoT is greater than the currently ticking DoT, all stacks included, it will overwrite it.

In other words, if a rogue without the talent applies the debuff one time, and then a rogue with the talent applies the poison, the higher damage version will take priority. Then, a rogue without the talent would no longer be able to apply his deadly poison to the target. If there are 2 or more stacks on the target then the rogue with the talent will not be able to apply his version of the poison since a single stack of his deadly poison is less damage than the higher stacked on the target. If there are, say, 5 stacks of normal deadly poison on the target it is a DoT for 680 total damage. The rogue with the talent will be trying, from the perspective of the game, to apply a DoT of the same type but it will only be doing 156 total damage meaning it is "weaker" in that sense.

Its also interesting to note that if your Expose Armor will decrease armor by more than the current armor reduction form sunder it will go through. Otherwise it will not.

At the moment with deadly V:

5 stacks can be applied total.

All of the damage from the stack will be given to the Rogue that applied the first dose regardless of who applied the rest. Ie. I can apply one dose of deadly then run off while a second Rogue continues to apply it for the remainder of the fight and I will be given credit for all the damage done through deadly.

It is not overwritten by the player with posion based talents.

With two Rogues it's a race to see who can apply that first dose. For that reason along with the fact that it consumes a debuff slot that may be better used we don't apply deadly in our raids.

Assumptions post patch:

If it follows current trends my prediction is that you'll be able to apply 5 of each deadly rank, the damage will be attributed to the first Rogue to apply a dose of each kind and it will not be over-written by talents.

Are there any debuffs that are currently overwritten by high talented ones? Obviously higher talented buffs will overwrite less talented buffs but does this also apply to debuffs on mobs? Sadly I'm not man enough to brave the queues and instability of the test realm to confirm this.