yes it does, before i got void i didnt hit over 32 while i was at AZs with salve ammy (e). After i got my void ive been hitting up to 37s. (both with 87 str btw) why would it stack when slayer helm and salve ammy don't? Oh god not this again... just read this thread so we save time. Long story short void's percent boost raises damage while salve raises strength, thus allowing them to stack. viewtopic.php?f=12&t=798769 On topic : Its really what you prefer, void definitely is better exp/hr then tanking. But personally I prefer wearing max strength and taking next to no damage then using void and having to pay attention more often. If you can time it right then you can recharge prayer in the time 1 combat round takes, so praying more/less doesn't hinder your exp rate significantly.