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%) :
Templar - [2.2 PHC] Ruz's mana guardian support *very ugly looking character* - Forum - Path of Exile
Bug Reports - Det Dead cost increasing after taking damage wearing Vivinsect - Forum - Path of Exile
3.22] Righteous Fire / Fire Trap Inquisitor Guide - Pathofexileguides
Reduced Mana Reserved - The Problem with Stacking and How to Fix It : r/pathofexile