In the Main Boss room of the Xennumet Dungeon a debuff is cast upon you when you enter it halting your EXP gain by -99%, making it impossible to gain levels in there.
When you equip your Xennu Suit, the buff from the room disappears.
No more EXP debuff?!
No. The suit itself has the -99% EXP.
Ok...and?...
Once you are in the suit, walk up to any mobs and die. DO NOT RELEASE.
Have someone rez you, when you die in the suit and do not release, the debuff is removed.
Ok, so how am i supposed to kill mobs for XP when they hit for 3000?
This is a group effort. Healer classes such as Cleric, Shaman (dont know if Bloodmages get the spell...) have a spell called Grav Blast that can two shot 4 dots and 1 shot 3 dots within the main boss room.
This seems confusing, where is the power leveling part?
For me i do this.
EXP range is 125m, so i have who ever i am power leveling (im a Cleric), stand in a safe location away from any agro. I stand in the center of an area and simply 1 and 2 shot mobs with my Grav Blast. 4 dot 45's in this dungeon give over 20/2000 points per kill to a level 40 player. Even when i did this from 45-46, i gained average group dungeon XP.
Downfall?
The person doing the power leveling will gain little to no XP through their time in the suit. However, if you get a group of people to do this all together you happen to be the only healer class who can 1-2 shot stuff, have the rest of them level you when you are done with them.
