Path of Exile - Page 951

We're trying out a change to aura costs, the Reduced Mana support, and the Enlighten gem on Beta. This change involves reducing the base mana reservation on reservation skills, changing the Reduced Mana gem to only apply to reservation costs but with a much smaller reduction, and having the Enlighten support gem reduce skill costs at lower values than Reduced Mana gave.

These are the intended results of the change:
As they no longer work with Enhance, we can make reservation costs less mana intensive for characters that previously wouldn't have access to Enhance, and reduce socket pressure for players that previously would have needed an Enhance support to reach the same reservation levels.
Reduced Mana becomes a much more desirable support. It now gives an option for end-game builds that are willing to give up sockets to reduce reservation, without the support being so impactful that every build that uses auras feels that it's absolutely necessary.
Enhance can have much higher values than previously, making it a better choice for reducing skill mana costs.

It's worth noting that a very high level Reduced Mana gem can reduce aura reservation costs to the point of the old Enlighten support and below, and that aura reservation costs are now often lower than otherwise possible until player level 45. We're also planning to increase the power of Mana passives in the tree that will give mana constrained builds more access to larger total mana pools.