It Is Now Possible to Achieve 100% Reduced Mana Reserved : r/pathofexile
Crafting 22% Mana Reservation Efficiency of Skills Helmet in 3.17 Siege of the Atlas | 967 - YouTube
The Mana Reservation Efficiency mastery has been replaced as there is now a much larger amount of Mana Reservation Efficiency for Curse Auras on the passive tree." (The mastery was 30%) :
Gameplay Help and Discussion - Mana Reservation Rounding Question [pics] - Forum - Path of Exile
Reservation - Path of Exile Wiki
Reservation - Path of Exile Wiki
Gameplay Help and Discussion - Mana Reservation Rounding Question [pics] - Forum - Path of Exile
Just a heads up if you're reserving your life with the new "Blood Magic" : r/pathofexile
New charisma .. : r/pathofexile
Bug Reports - Corrupted jewel mana reservation does nothing - Forum - Path of Exile
Templar - [3.8] The Everything-ish Aura Guardian - Forum - Path of Exile