Libram of What Might Be Truth, Maybe
The Libram of Absolute Truth has been on a bit of a roller coaster on the patch 2.4 PTR. Its current form on Live servers is a 27 mana off of Holy Light. The PTR gave it a boost to an 84 mana reduction, but it has recently been gutted back down to 34.
While 84 mana off is really, really nice, I can understand the nerf(or fix), even if it makes my paladin buddies sad. Off of the top rank of Holy Light, it was a 10% reduction in mana cost. In general, a bonus that large comes from 5 talent points or a set bonus rather than one piece of gear, and unless it diminishes over time, it would be hard to beat that bonus in a Relic slot for Wrath. Unless they start adding raw stats to Relics, which they've stated they don't want to do, things would start looking pretty crazy to top that.
In the 84 mana reduction state, it was possible to cast Holy Light rank 2 for free. While not a big heal considering you acquire it at level 6, it was something to do when you're completely drained of mana. You can still do this with the 'nerfed' version, but with Rank 1 of Holy Light, so I'm not sure if that had any effect on the decision.
There's also a strong possibility the devs have crappy handwriting and the people punching in the values read 34 as 84. Who knows?
