After the patch on Wednesday or server resets/crashes today, regular xp on Mangler is back to pre-God levels. On Monday this week, the planar armor turn-in for Ethereal Mist boots gave 0.279 regular xp. Just now, it is giving 0.151 regular xp. Both were at level 65. As previously stated by devs, the quest xp modifier is the same as the regular xp modifier. There are many anecdotal reports confirming an XP reduction, but this was the only hard data I could produce as I didn't keep actual mob XP kill data previously to patch day. Given that OoW is releasing on Wednesday, it is important that is remedied quickly.