I just dinged level 53. I'm a halfling druid with 255 Wisdom and with KEI I have over 3000+ mana points. Even with that much wisdom and kei I still run out of mana on the disturbed elysians.
Just an FYI, this zone is pretty quiet now (even though it is considered an experience zone hot spot). The lowest level elysian is 53 (even con).
I've been able to take down 2 at a time using Winged Death, Drifting Death, ES Vambraces, Immolate, and Luminecent Staff (lightning strike clicky). Without the staff and vambraces I don't think I'd be able to solo these guys at level 53.