[FIXED] [Multiple] Damage Percentage Buffs vs. Spells that Deal Weapon Damage as Magic Damage

[Dreadblade]

WoW Freakz spell link: N/A
Bug description: Abilities that deal a percentage of weapon damage as magic damage receive double benefit from auras that increase all damage.

Shadow Blades double dips from any of the damage buffs granted by Bandit's Guile.
Basically Shadow Blades is 100% of your weapon damage done as shadow damage.
I will explain this alongside the video.

Without any damage buff, weapon / auto-attack damage and Shadow Blades damage correspond perfectly.
Weapon / Auto-attack damage: 105-109
Shadow Blades damage: 105-109

However, this changes when I receive any buff that modifies damage done by a percentage. Such as Deep Insight from Bandit's Guile. (+30% damage)
Weapon / Auto-attack damage: 136-141
BUT Shadow Blades Damage: ~180
What happened, basically, is that shadow blades received twice the benefit from Deep Insight.

The physical damage already got boosted by 30%, from 109 to 141, but then shadow blades gets boosted by 30% an additional time since it deals shadow damage.

Why does this happen?
Basically every +X% damage buff does 2 things:
1. It increases Physical damage by 30% (so that includes weapon damage)
2. It increases Magic damage by 30%.
Since the weapon damage has already been increased by 30%, shadow blades shouldn't receive another 30% buff just because it deals magic damage.

Proof: https://youtube.com/watch?v=C8Z809bw3ww:

[Seyrox]

If this is true.. is it like this for scourge strike or other things like this ?



Demonolgy Warlock Guide 5.4.8

[Dreadblade]

No, this doesn't affect spells that are based on the damage of another spell.

[Sumoo]

This should be top priority . For 2 days already everyone suddenly rerolled rogue and they are oneshoting everyone with shadow blades + ks combo .
Note : Not a QQ post

[Wanjin]

@shocker

[Funkstar]

Well nice find,i hope it will be fixed before tournament.

[owfg]

If is like how you sayin, warriors need to be nerf2 cuz of https://www.wow-freakz.com/spells.php?spell=13046

edited

[Scott]

owfg wrote:

If is like how you sayin, warriors need to be nerf2 cuz of https://www.wow-freakz.com/spells.php?spell=13046

Warriors are fine:

Without enrage: http://i.imgur.com/VG6rQpA.jpg
With enrage: http://i.imgur.com/YfBn3ga.jpg

I'm pretty sure this is a rogue only bug, because that buff is kinda unique, it increases all damage (physical, poisons, the legendary meta etc.)

[Arahanmdrqt]

He is just too mad his class will get nerfed/fixed to the ground and he won't be able to one shot everything duh.... Shocker we need you to cofirm this bug!

[Dreadblade]

I did some more testing and this issue only affects spells that deal a percentage of weapon damage as magic damage (such as shadow blades or divine storm). That's because auras that increase all damage will first increase physical damage (upon which the spell is based) by X% and then it will increase magic damage by X%, resulting in a double benefit.

I edited the title and main post, so that it's less misleading...

[Vvtf]

Dreadblade wrote:

I did some more testing and this issue only affects spells that deal a percentage of weapon damage as magic damage (such as shadow blades or divine storm). That's because auras that increase all damage will first increase physical damage (upon which the spell is based) by X% and then it will increase magic damage by X%, resulting in a double benefit. I edited the title and main post, so that it's less misleading...

Maybe you are right but can you test it with those echants to see if is not SB the reason maybe is the spell's + bandit, maybe it will increase the damage for 30%(130%) at character panel and also if buff is up it will be 30% more for spell's, dunno just test those

Icebreaker (wowhead link)
Frost Oil
Shadow Oil

[Dreadblade]

Yes, guile increases both physical and magic damage, I already tested it with poisons. But the problem is that deep insight increases your weapon damage by 30%, and that already increases shadow blade's damage. Because of that, it shouldn't get increased by 30% again. Since it double dips, it's a 69% damage buff to shadow blades, excluding killing spree's 50% damage buff, which would result overall in a 153,5% increase in shadow blade's damage.

Also the enchants you mentioned earlier have no relevance, they are not dependant on weapon damage.

[Vvtf]

Dreadblade wrote:

Yes, guile increases both physical and magic damage, I already tested it with poisons. But the problem is that deep insight increases your weapon damage by 30%, and that already increases shadow blade's damage. Because of that, it shouldn't get increased by 30% again. Since it double dips, it's a 69% damage buff to shadow blades, excluding killing spree's 50% damage buff, which would result overall in a 153,5% increase in shadow blade's damage. Also the enchants you mentioned earlier have no relevance, they are not dependant on weapon damage.

From where that 9%? you said double 30%x2=60% or you type it wrong? maybe it should get 30% more cuz is shadow damage it's hard to find a proof for this

[Dreadblade]

100 * 1.3 = 130
130 * 1.3 = 169
169 * 1.5 = 253.5
253,5 * 1,5 = 380.25

So actually... it's a 280,25% increase. I forgot to add 50% twice. It stacks multiplicatively, not additively.

[Wintz]

Arahanmdrqt wrote:

Shocker we need you to cofirm this bug!

Healers getting randomly nuked,KS without a buff,for me it will make a difference between good and bad rogues.
The good rogues will still stay on top so yeh.