Multiple skills with >50% mana reserved

So if I cast 2 auras that both want to reserve 60% of my mana, would I end up with 60% of 60% of my original mana aka 36%?

No, 60%+60% in this case = 120%.

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WarriorAvi wrote:

No, 60%+60% in this case = 120%.

So you will have no mana to use whatsoever? But you can do that nonetheless?

You can't reserve more than you have. Just like you can't use a skill when you don't have enough mana.

He was trying to show that the reserve is a percentage of your max mana, not your current mana.

To expand on the information already provided; in order to use several auras you can use the Reduced Mana gem, a few uniques with a specific mod for aura mana reservation, and passive tree nodes for aura mana reservation. Depending on the amount of auras you want to run, you can calculate how many nodes you need along with the Reduced Mana gem to be able to use them at once and still have enough mana to cast your skills. Another option, for example, is to reserve your whole mana pool with auras, then use Blood Magic support gem on your skills - there are lots of possibilities on how to utilize the games' mechanics to achieve what you desire.

You can spend more than 100& of your mana on auras.. but only if you use the abovementioned ways of reducing the mana requirements of said auras.
I am currently running five %-Auras on mana (3*60 and 2* 40).
(And of course you´ll have to use Blood Magic for your other skills... )