How do DoT works?

Hi guys,
I have a question.

If I attack a target with two skills dot laying on the same target, for example:

Chillsurge: 768 frostburn damage over 4 sec
Trozan’s Sky Shard: 876 frostburn damage over 4 sec

Then the target receives what damage:

A) 876 frostburn damage over 4 sec
B) The last one that was applied to the target.
C) (768+ 876) frostburn damage over 4 sec

?

C. http://www.grimdawn.com/forums/showthread.php?t=51898

Sources
DoTs are able to stack, but only from different sources. Sources are different skills, item/devotion procs, and weapon damage. For example, Night’s Chill, Blizzard, Nightfall, and a Savagery strike applying Frostburn damage will have all of their Frostburn damages stack on top of each other. However, when an existing source is applied again, the DoT simply reapplies and does not stack on itself. In the above example, using Shadow Strike again will reset the Nightfall Frostburn DoT. HOWEVER, the Savagery strike will deal Flat Frostburn damage from the weapon damage as its source, meaning that the weapon damage component of Nightfall (around 40%) will be overridden by the weapon damage source from Savagery (since it’s much higher). (Thanks Silben!) Nightfall and skills like it actually deal two sources of DoT damage; weapon damage, and the skill itself.

I had already read this topic, but I found it confusing to understand by the Google translation.
My language is not English.


I really wanted to know if it’s worth having these two DoTs on my biuld or should I choose one?

Searching, I found the answer, and I’ll leave it here if it is anyone’s question.

This works similarly for debuffs and damage over time effects. If you apply a % reduction to a monster’s damage by using a skill and then do the same thing with a weapon attack, only the strongest debuff will be take effect. The effects do not stack. 
Damage over time (DoT) effects are different. Unlike debuff effects, DoTs stack from different sources and always do full damage. For example, if you apply Poison with your weapon, and then another Poison effect with a spell, both will deal full damage.

Source: Grim Dawn Wiki is a FANDOM Games Community

Therefore, the answer to my question is ©.

What is not stacked are the debuffs