Just parsed 299sec ( 4 minutes 59 seconds ), Panther procced 377 times at 280 damage per proc
So, 377 x 280 = 105,560
105,560 / 299 = 353 dps
panther use to hit for 640 ( cus of chromantics focus ) with no bard
because the proc rate didnt get effected, i can simply substitue the 640 figure where the 280 figure was, that was the only variable changed
377 x 640 = 241,280
241,280 / 299 = 806 dps
so, without a bard ( big difference with one ) the difference is 453 dps or 135,720 damage
*NOTE* my accuracy on this mob is a ton higher than on almost any raid mob, so the actual dps on a raid mob is going to be lower, how much depends on the mob AC, but the difference in dps will still be the same.
With a bard, and chromantics 5 aug, you do 880 per proc, so lets sub in that number
377 x 880 = 331,760
331,760 / 299 = 1109 dps
With the new version of panther, chromantics and a bard, the proc will be 385 damage
377 x 385 = 145,145
145,145 / 299 = 485 dps
So, with a bard, you lose 624 dps per char ( on a dummy mob, its probably less in all actuality )
For comparisons sake going to put all the numbers in a row
New Panther - 353 dps
New Panther w/ bard - 485 dps
Old Panther - 806 dps
Old Panther w/ bard - 1109 dps
Now lets put these numbers in to play.
Lets say you have 4 melee in a group over a 5 minute fight with a bard, and they all swing and proc exactly the same amount that harney did ( just so we can see what kind of effect this will have on raids ). It's unlikely anyone needs more than 4 well geared melee and a bard to dps down any raid named.
5 minute fight, 4 chars, old panther + bard = 4436 dps or 1,330,800 damage.
5 minute fight, 4 chars, new panther + bard = 1940 dps or 582,000 damage.
Cazic Thule has 7.5 million hp, Terror, Dread, Xeg, Fennin have 5 million.
That's really about as far as I wanna dive in to the numbers, the dps I listed is panther proc damage alone