Void and slave do stack thank you very much.
I have done trianing and checke my stats and setup etc.
With JUST void bonus my max hit was 31
with JUST slave (e) my max was 32
With BOTH my max was 34
I hit several 33s and 34s during about 2 weeks of training.
Therefore it is 100% conclusive they stack
i have trained with void+salve many times and i never get more exp together, than i do with just salve. i have done probably 24 hours training OR MORE with salve and maybe 15 together and have never had higher exp rates
they DO NOT stack
Tested it when I first got full void, noticed a few higher hits that I never got with just salve (e).
Also to OP, if you had questions about these things then you can use the help and advice forum to seek the answers.
How on earth does bonus stacking relate to xp anyway?
Sure if you tank out str bonus equipment so tht u can hit like 15 damage higher than u culd do without the str bonus you're gonna see a big xp increase.
But void and salve stackting ur looking at a gain of 2 - 3 max hit and a gain in accuracy whihc means it is more effective but the overall impact on xp rates isn't gonna be super duper huge.
And oh wow really you trained for a whole 24 hours? That really disapproves the fact I spent 2 weeks at about 6 - 8 hours a day training with the set up and consistently hit numbers that are 100% impossible to hit with my setup unless both bonuses were taking effect.