So far I have around 800% extra ED on my santuarydin and i cant see a difference in killing a5 mobs.

6 hits for a Fire Boar (Non demon)
5-6 hits for Death Berseker (demon)

Just looking for someone to test if it works or not before indulging in this character more.

Using unique Holy Water Sprinkler: The Fetid Water Sprinkler.

I'd pretty much like someone who knows about the mechanics of the game to test this.

The Force is weak in you.

Well some jedi are just weak. Jedi have a forum too. =D

Maybe a lil' late to the party, but I was poking around about something related.

Does for example +400% dmg to undead/demons on wep translate into a dmg increase for the skill that use it? as in, if you do 10k, would you do 40k to demons/undeads?

Well, in 1.09 and earlyer patches, this was the case, but resulted in stuff like 2-3 shotting hell meph. In 1.10 patch blizz changed it into only increasing WEAPON damage against those

So if your wep does 1k dmg, and wep has 400% extra dmg to undead/demon you will do (10k normal skill dmg + 4 x 1k extra to demons) = 14k dmg to demons./undeads vs your original 10k.

Your situation may be similar, If your sanctuary adds 800% dmg to demons I'd wager it does so by adding the % internally to wep dmg. If that wep does 100 top end dmg, you'll have a extra 800 dmg against demons for your 800% sanctuary (still ok-ish for zealing)

that is pretty much how any skill %ED works.
400% ED from concentration doesn't turn 10k dmg to 40k dmg, you end up with around 15k dmg instead (varies with weapon and lots of other variables).

Play around with the dmg calculator if you want to get a better feel for it.

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People who live in cinder block houses can throw whatever they want.