Absolutely what Haplok said.
I made some tests recently to check which invisibility effects breaks on which action and the advantage of Smoke Veil is that it doesn't break from pure DoTs. Shadowing Beyond however does break. That means while you can use Gouging Strike, Toxic Strike, Lover's Embrace and so on with Smoke Veil and remain unseen while they tick, you can't do it with Shadowing Beyond and also NOT with Arkemyr's Brilliant Departure (which doesn't break on pure CC/debuff hits unlike Smoke Veil and Shad. Bey.).
Most invisibility effects are implemented in different ways as you can see. Which is weird but that's what we got.
You have to separate direct damage from damage over time (DoT), even if it "pulses". I mean sure: semantically/logically Chillfog also does damage over time. But as Haplok already pointed out stuff like Chillfog does a new attack roll with every "pulse" and then applies direct damage as a result of that attack roll. DoTs just do one attack roll and put a damaging effect on the enemy and then the "ticks" just keep coming.
There are some key features that separate the two:
DoT abilities:
- one attack roll at the beginning
- applies a hostile effect with a duration on the enemy
- that effect causes damage with every tick (usually every 3 secs but there's also ticks of 1 or 6, even 12 secs)
- can be shortened with high RES or dispelled with stuff like Clarity of Agony and all other stuff that reduces hostile effect duration.
- you cannot get rid of them by simply leaving the area.
Pulsing abilities:
- an attack roll with every pulse
- usually applies the effect on the ground (Chillfog for example, Binding Web, Slicken, Wall spells...) but may also be anchored to an enemy or ally (rays or beams). There's nothing on the enemy (except of course if the pulses themselves cause a secondary effect like Blind - but that's not the original pulsing effect).
- that effect on the ground/in the beam also causes its effects to get applied with every pulse but with a new attack roll.
- cannot be shortened with high RES etc. since the effected is not places onto the enemy directly.
- you can leave the area and thus stop it from hitting/pulsing on you
Because this has several mechanical implications (e.g. Combusting Wounds gets triggered by pulses but not ticks, interrupts while being Energized can happen with pulses but not ticks) the terms "DoT", "ticks" and "Pulsing spells/ability" with "pulses" have been kind of established - at least here in the forum - so that we can distinguish between them rel. easily.
The same is true for Healing over Time (HoT) and Healing pulses really. Lay on Hands is Healing over Time, Consecrated Ground is Healing pulses. Just no attack rolls here in general. But HoT can be dispelled (Arcane Dampener etc.) while Healing pulses cannot. But for healing pulses you have to stay in the AoE while with HoT you can go anywhere one it's applied.
And so on. Big excursus, sorry - maybe overkill - but maybe also interesting.