My second prodigy was Irrestible Sun, after noticing that sludgenest was created. I used judgement,IS and stairway running while the slimes were weak. Luckily i had some room around me when the slimes became harder. So i could use Irresistable Sun to lure only 1-3 enemies at once to me.
I used a mindstar with life leech in the main hand to keep my hitpoints and psi full most of the time. Many stings with a needle have a better chance to heal than one big hit: telekinetic weapon, agony, radiance, dream forge, ...
Radiance wasn't a total waste. With range7 it was a big help to keep madness effects on enemies outside of melee range.
I left the sludgenest when my saves were well above 120 effective.
The rest of the game proved to be way easier than the sludgenest.
I played very very carefully with a playtime of 2days, 8 hours... clairvoyance, stone walking, movement potion, scanning each bigger enemy for its talents, ...
Do i think that i would have made it without having sludgenest in the game? Don't know.http://te4.org/characters/3263/tome/32dce5d6-bb61-4d1c-830f-bb130d292c38