If so, is it additive (100% + 50% + 50% = 200%) or multiplicative (1.5 x 1.5 = 2.25)?
I think most do and one or other combination don’t work. Don’t quote me tho.
Also I don’t know the math behind it.
Damage amps do stack and I THINK its additive
all damage amps stack, and it’s additive. 100% + 50% + 50% = 200%.
discord is special. it’s considered defensive debuff instead of offensive buff, so it alone is multiplicative.
The only answers I can really find are from 2017
Here’s a video of a guy testing it (Back when Mercy had mass rez, so it’s old)
What if this could work, nano + Otis’s ult + mercy staff + amp matrix + discord. What would that math be.
All are additive with the exception of Zenyatta’s Orb of Discord, which is multiplicative.
Mercy: +30%
Orisa: +50%
Ana: +50%
Baptiste: +100%
Zenyatta: x1.25
Zenyatta’s boost is multiplied after all others.
So basically, you get 200% from all the ults
230% boost when you add Mercy Staff in
THEN multiply THAT by 125% from discord
We take a Scoped Widowmaker shot
120 damage,
After boosts it reaches 330% damage, which is 396
Then discord bumps that up to 495
THEN it can headshot which totals up to 1,237.5
Just enough to take down a B.O.B in one shot
Edit : Discord only debuffs by 25&
You are to smart for me.
(100%+50%+50%+30%+100%)*1.25 = 412.5% damage output
Does Orisa fortify and Ana nano damage resistance stack, both of which are 50% adding up to 100% damage resistance 
Nope, Damage resist stacking happened exactly ONCE with Bastion
It was Hotfixed with a Napalm Spewing Flamethrower.
Boost is additive and debuff (like discord) is multiplicative.
ok but guys, someone needs to test a combination of:
Mercy amp
Nano Boost
Supercharger
Amp Matrix
Discord
i gotta know how much this would do
I already did the math.
Just add everything but discord together and then multiply it by 125%.
It does 412.5% damage.
oh, well can anyone show a visual of it as well?
I’m not sure what you want a visual for. Can’t you just imagine it?
That but the B.O.B is instead shredded into scrap as his very existence ceases.