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Same as above actually, he uses a 2.33 crit damage multiplier, where (I assume) it should be 2 * 1.33 or 2.66 as the total damage is modified by 33% not just added to the crit multiplier percentage. I have searched and found nothing absolute from riot, but it is how I have interpreted the runes, It is extremely hard to verify this math in game. If I find out anything new I will update it.

My assumption was that that all crit damage modifiers are added linearly, not multiplied.

Ex) 200%(base) + 33%(runes) + 10%(mastery) = 243%

An easy way to verify this(or deny this) will be the following:

1) Start a Bot Practice Game with Crit Dmg mastery and Crit Dmg book.

2) Get Last Whisper + as much Armor Penetration as you can. NO IE!

3) Test your damage out on a jungle creep.

4) Repeat, this time with IE.

With Last Whisper and ArPen items, you would deal true damage to weak creeps.

Therefore, you will be able to check how much damage your crits does easily.

1) All modifies are linearly added(IE is treated as +50% crit damage)

Step 3 will give 243% damage, and step 4 will give 293%.

2) All Crit Damage modifiers are added, then multiplied to the coefficient. (200% or 250%)

Step 3 will give 286% damage, and step 4 will give 358%.

3) All Crit Damage modifiers are multiplied. ex) (rune) * (mastery) * (skill) * (IE)

Step 3 will give 293% damage, and step 4 will give 365%

2) and 3) might seem similar. They can be differentiated with Tryndmere.

With 8 stack of Bloodlust lvl 5, you get 36% Crit Dmg.

2) 358%, 446%

3) 398%, 497%

I'm currently on a campus computer, so I cannot check now.

Not to mention that I don't have any crit dmg runes.....

If someone would try this out, I'd appreciate it.

Yeah.... even without crit dmg book, you can use Trynd to check...

But then you can't confirm the interaction of crit dmg runes with other crit related things.