Okay so we tested this on the PTS (which is running version 1.1.1) with the following abilities:
DoTs in the Video
Swallow Soul
Agony (and Prolonged Suffering)
Crippling Grasp
Blood Craze
Venom Arrow
Force Pulse
Elemental Ring
and generic Fire/Frost damage over time from enchantments
All of these DoTs were tested both offensively (NB applying) and defensively (being applied to NB).
Conclusion
We found the only one that did not seem to be working as intended was Crippling Grasp. Currently, a NB cannot go into stealth if he has this active on an enemy target. So if player A applies Crippling grasp to Player B, player A will not be able to use Dark Cloak while that DoT is active.
For each other ability, if it was applied to the NB, Dark Cloak would remove the DoT and the NB would not be pulled out of stealth before the full duration of Dark Cloak had ended. If the NB applied the DoT offensively, they would likewise not be pulled out of stealth even though the DoT would remain active on the target.
Non-DoT's Tested
Since people had reported some other abilities also pulling them out of stealth (non-dots) we also tested:
Back Lash
Reapers Mark
Daedric Curse
Invasion
Conclusion
If a NB is targeted with Invasion, and pops Dark Cloak, the invisibility will break target and the shield charge (Invasion) will not land (this takes timing though). Reapers Mark and Back Lash both stay active on a Night Blade who uses Dark Cloak, but the effects cannot be seen by enemy players while the NB is invisible (which makes sense since these are not DoTs.) Daedric Curse, although its not exactly a DoT,
does get removed by Dark Cloak.
DoTs Tested Which Will Not Appear in the Video
I believe everything I mentioned above was recorded. However, we were testing this for a while and more things popped into our heads after I'd stopped recording. So these abilities (plus maybe one or two of the above ones if I made a mistake) do not appear on video, but were tested.
Entropy
And I think that might be the only one we didn't get on film....I'll edit this later if I remember something else.
DoTs We Didn't Test
Searing Strike (and its morphs)
Fiery Breath (and its morphs)
Summing Up
So as far as I can tell this is working mostly as intended on 1.1.1
with the exception of Crippling Grasp, which obviously seems to be a bug since no other DoTs work that way.
Dark Cloak will remove up to 4 damage over time effects (at rank 4) when you enter stealth. This seems to work with each DoT. You will not be pulled out of stealth with these DoTs active.
Dark Cloak also works even if you're the one applying the dot. You can hit someone with Blood Craze, then use Dark Cloak. You will not get pulled from stealth and your DoT will stay active.
Other abilities also do not break Dark Cloak (Curse, Invasion, ect.).
However, any form of ground based AoE like Lightning Splash, Elemental Blockade, Inferno, or Ash Cload will bull you out of stealth if you stand in its area of effect (tested all of those, but don't have all on film.)
So maybe ZOS fixed this? I don't know. I'm not sure why our testing differs so much from people's reports unless ZOS has already worked on this. Remember that this testing was done on 1.1.1 and not the current Live patch. Can you tell us if this has been fixed
@ZOS_JessicaFolsom ?