Skill Upgrade question
Are skill chance upgrades additive or multiplicative?
I understand some skill upgrades are multiplicative but had assumed the chance increases were additive (e.g. 80% chance to place a provoke would be 100% chance after two +10% chance upgrades).
I am hoping someone here can clear things up or point me in the right direction.
I am posting two links below to an example of where Umbral Enchantress with 80% chance plus two 10% chance upgrades, fails to place a provoke on all of the target champions, in this case, Apothecary was not provoked, and I didn't see any text (i.e. resist) scroll by to indicate a reason.
The second link is to a short video showing Umbrals skills and upgrades.
Example of provoke not being placed - https://youtu.be/20LJ4WYJFFQ?t=23
Umbral Enchantress Skill - https://youtu.be/F9MTPBk3NYo
Thank you all, and stay safe.