After defeating the orc ambush with lvl 30 I already thought that this char will make it veeery far.
The game between the defeated ambush and the final fight was no challenge, I just activated every sustain I had and clicked on enemies until everyone was dead.
My 3 shield, effective skill level 7.5, reduce most damage by 53 points. Combined with 2 healing infusions its enough to never have to release them.
With survival being no problem, I focused on finding nice weapons for tripple wielding. For the peak I used mainhand weapon with slime damage for slow and of daylight, offhand dagger of daylight and telekinetically wielded 2h weapon with ice for freeze and of daylight. The 3 of daylight gave me a little over 140 light damage on hit for each weapon, easily surpassing all other kinds of weapons. All weapons were reshaped with +20 attack and damage.
I had a point in reshape armor, but physical damage was never a threat and reshaping needs "grinding" for psi, turning my buffs off and taking off my armor to get enough max psi, then letting it fill by getting hit by weak enemies, so I never used it.
After an seemingly endless ascend I finally reached the final fight. I only remembered a bug report about that the sun paladin turns hostile, so I just let him/her attack one of the mages and observed the fight. Before she died I joined the fight and soon after the paladins death the first mage fell.
A few monsters appeared from the 4 portals, but sealing them with the orc orbs had no result, so I just ignored them.

Elandar refused to die, teleporting away whenever I was near, using regeneration to heal, free action infusion to avoid getting frozen, damage reducing and possibly slow removing wild infusion and I think a shield rune too. Also invisiblity that didnt quite worked well together with the particle effects ( of the chant and maybe others ) that still gave his position away.
Slowly the room began to be filled by mostly dragon hatchlings and being filled with darkness without him taking any real damage. I knew I had to change something to have any chance of success.
First I equipped the copper amulet of greater telepathy to be able to track him ( except when she teleported out of range, duh ), replaced first my teleport rune with controlled phase door, and later my shield rune with another controlled teleport rune to be able to keep up with him, used my stat and talent points, althought I ultimately made no use of them.
With the help of my 2 controlled phase doors I could chase him down fast enough, without having to go through the hundrets of dragons which were trying to find out which color is the strongest ( why do the different colors attack each other anyway? ).
Frenzied Psifighting was used when he wasnt alone to increase the chance of him getting whacked by my psionic weapon, and very soon I saw the force of my (~800 damage total against normal enemies ) attacks draining his life.
Elandar finally died and to my surprise I got the Tactical Master achievement for winning the fight without closing any portal. *faceslap*

All in all it was a epic final fight that I could have never won without these extremly powerful sustained shields, they probably should get nerfed, and with the right items I brought with me by chance.