Did nm pre 1.5 and 1.5.3 insane recently
. If u played diablo 2 as necromancer you will love shadows. For 1st category i would always upgrade em. 4 instead of 3. They will do all job with rares/uniques/bosses while u smoke. Simply because umbraphage isnt reliable drop.
Good guide and relevant except 2/5 Gesture of Guarding. Dont remember exact numbers but in 1.5+ its about 10 before and 20 after psiblades. NM was with Advanced Shadowmancy, insane - One with Shadows. Both thalore and both werent very useful. One with Shadows 3rd skill used only once and 4th was only to decrease max hate by 40 (was careful 36-50lvl). Guess if you dont have sentry/treants Advanced Shadowmancy is better. Not even considering darkness - it causes lags.
For prodigy mental tyranny is god. Imagine you have maxed madness and alchemist gloves (5dmg sources property), 1 autoattack - enemy stunned+slowed+confused and have -80% mind res. It aslo works with AM shield manaburn dmg.
Items. I have a feeling that unseen force count every target for mnemonic. Could run it twice sometimes with 11 duration and 30CD. With crimson robe reproach becoming good dmg skill.
Be care with archers and gunners.