What you are referring to is called snapshotting, and no it isn’t needed for most DOTs anymore. Once upon a time, this was a major player in dot class rotations. For example, affliction always wanted to apply their dots when they had haunt + trinkets + pot up and then not refresh until they ran out, because if they refreshed the new dot would do less damage. That is not the case anymore, and instead dots are what we call “dynamic”.
That is, for Most Dot abilities, you do not need to reapply - the damage it deals is going to be dynamic with your current level of stats at the time of the damage tick.
There are a few random spells that still snapshot, where you would have to update, I believe feral has 1 or 2 ability that still does this.
Otherwise, no, if you apply rend with 8k strength and it ticks for 4k at the first second, then pop your potion, the second tick at 2 seconds will tick for 5k (or whatever the new number would be)
Edit: Someone below listed the feral spells, bloodtalons and tigers fury.
Im pretty sure it works on a tick by tick basis so no need to reapply.
Like I’m 90% sure I can press schism after using purge the wicked and not worry about it. Same with an intellect trinket. Although we’d miss out on a few ticks higher damage.
Don’t quote me though because I am absolutely clueless.
Okay so I cast Rend at 8k strength it ticks for around 4k
Then I get a STR proc now I have 9k strength. The original rend I cast from before the proc will tick for more without having to reapply is that right?
Meaning that any buff you get, will be applied to your damage profile in a passive manner, and then drop off automatically when the buff runs its course
I believe feral is the only spec that snapshots, though I may be mistaken.
As for feral snapshotting, it applies to two abilities, rake and rip. The abilities that adjust the snapshot number are only those found in the druid/feral toolkit. So no external buffs from other classes or items affect the snapshot total.
Yes. Snapshotting does not exist for like 99% of DoTs and each tick will update dynamically with your stats. The same can be said for like bloodlust increasing your haste and increasing the tick rate of all your active DoTs.