I believe shadow door basically just casts improved invis. on your character, with a different animation? Or is there a difference? I always saw it as a flashy, useless spell.
As for an underrated spell, I'd say Web possibly.. Early in BG2, its invaluable. When clearing out Nalia's keep, and fighting the Trolls in the Chapel, I found webbing the ground, summoning creatures to protect Edwin, and then fireballing the heck out of the immobile trolls worked wonders. It also works great when fighting the Cowled Wizards in Athkatla. When paired with the priest spell Tangle, alot of times you can really lay the smack down while baddies can't move.
Also, Greater Malison makes alot of the death or other spells with high saves actually useful. Greater Malison + Finger of Death can take out alot of tough cookies. GM + Feeblemind is another nice one.
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