personnaly i run 3/5 warp 5/5 shaterred stones and 5/5 chains at lvl 18. #full AoE(i mostly go 3v3)
i think u should take blinding fire at 18, usefull when 1/4 bcs it is dmg, and also allows u to blind.
then u can take ennoblement at lvl 20: make it 3/4: allows u to cast all dmg spell without beeing stunned and ignoring poison. #>>>>locks
then for lvl 22 u make 4/4 ennoblement and take dragon eye: thus u can >>>rogues and u have more accuracy, so can concentrate on more critical gears.
if u prefer u can take:
lvl 18: blinding fire
lvl 20: ethereal barrier 3/3
lvl 22: dragon eye (make blinding or dragon eye 2/4)
this is good too, ethereal barrier can be a good skill at 3/3, especially if u got eye wich increases speed (so more often barrier)
but if u are stunned, then the ennemy rape u while u can only absorb one hit with barrier, as u can't attack again.
moreover reflection runes destroy it.
the main interest is on blocking the main attack skill of the opponent if he uses it first.
In the last configuration u should try blind-wrap-stones-chain to be able to cast all spells, but it might be hard with low amp blinding fire not to be stunned before u wrap. need good pt mates.
personnaly im definitely going for the first combo.
Pls notice i haven't tried those skills, im almost 18. i just made some research about them.
with the first combo during ennoblement u can spam 5 attack skills (fireball-wrap-stones-(chain)-blinding fire-fireball) with accuracy(dragon's eye) and several normal attack (speed of dragon eye). That is a lot of dmg.
u also can help with eye or ennoblement if someone is really OP in ur team, to make sure he can make best use of his skills, and u stay behind, jump (wrap) when they try to stop ur ally and spam dmg.
for lvl 24 i think i will take blazing ground (more AoE dmg, slow and chance of fear). but i really don't know.
frozen bolt and overload may be good too.
at least i think up blinding fire at lvl 24