Q:
Doing Math(Cond DMG vs Cond Duration)
comes down to what content your doing and what conditions your applying and how often your applying them.
For example if your hitting 25 stacks of bleeds and continually refreshing them with autoattacks that apply them then durations not going to do much, but if you apply stacks only occasionally then duration comes in more useful.
Also you have to keep in mind for condition duration that it only actually increases damage if it increases the duration by a second, half seconds go to waste.
There’s a good thread in the necro forum about this:
https://forum-en.gw2archive.eu/forum/professions/necromancer/Conditionmancer-Dmg-or-Duration/first#post1657739
I run Power/Condition/Vitality will a full set of Superior Rune Of Undead. I end up with about 2K Power and 1.3K Condition Damage.
You can play around with your Trait Lines to get good condition durations or eat some food as well.
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