It seems to be Additive rather than Multiplicative.
Tooltip Update
Can still spam Rending slashes and this time, can get consistent hits with the enchantment, even with full spam going (No LA's)
Did some dueling testing, and the hardening glyph will refresh only when it's removed, but it can be refreshed around every 3 or so seconds.
So, if it is indeed additive, then these are the ICDs:
10 * ( 1 - 0.5- 0.3) = 2s
4 * ( 1 - 0.5 - 0.3) = 0.8s
As much as I would love this change, I understand that this wasn't their intention.
So, either it was turned to be additive, or they just forgot to actually code in the tooltip, and just left it as it is.
Edited by Avran_Sylt on July 18, 2017 1:45AM