SWGRclan has already stated the points that I would, but I feel that I should reiterate points that stick out to me.
Itharel have no true counter. They are beings of living ichor that can bring holy armor to materialize around themselves with little to no effort. Their healing powers, if they have access to such, are relatively unparalleled. An Itharel effectively destroys Dread Knights, Wraiths, Undead, Ghouls, and other Dark Arts practitioners with little to no effort. The side of 'evil', as a roleplaying group, has little to offer to combat these paragons of light, and as such, battles are relatively one sided, unfair, and unenjoyable as a dark arts player.
A wraith, who some may consider the pinnacle of dark arts power, is essentially the big bad evil guy of the player run side of darkness. In contrast, the Itharel are the big bad good guys of the player run side of light. It would make sense that an Itharel and a Wraith should have epic combat, but the combat between a Wraith and an Itharel might go something like this.
Wraith Bob, who is a master of necromancy, attempts to drain the Itharel.
[!] The Itharel, Sally, has no life-force capable of being drained.
Wraith Bob, noticing this, uses earth evocation to blast a spike of earth at the Itharel.
[!] Sally's armor takes the hit. Sally stumbles back, gathers her focus, and blasts a ray of light at Wraith Bob.
[!] Wraith Bob demanifests almost instantly.
There is no need for the side of light to have such an impossibly strong counter to all of the Dark Arts. At this point, all it would take to defeat an entire gathering of the dark arts players on the server would be an Itharel, two golems, and perhaps four other clerics.
I am a fan of dynamic role-play. With the current strength of Itharel and Clerics alike, there is no dynamic -- there is only defeat. I hope for, as SWGRclan put it, "something creative and contributive to roleplay that doesn't involve vigorously beating hooded gents down with weapons made of light. "