We all know the staple spells. One is mention in almost every topic and lists of them can be found in the Handbooks. This thread is meant to be an index of spells that should be more well known! Be it a crazy gamebreaking spells or something that could be helpful in a common situation, these spells just don't get the attention they deserve. This topic serves not only as a place for showing off great finds, but also as a archive/reference for someone looking to make there spellcaster a little more exotic.
Friendly Fire (4 wizard/druid) - either an immediate action cast or round/level buff, this spell makes you immune to all ranged attacks, including rays. not only are you immune, but you can redirect them to a target within 30 feet. there is no action to redirect either so you can just ignore entire combat styles(Exemplars of Evil)
Pacification (4 bard/ 5 cleric)- No saving throw, concentration up to min/lvl. Acts as Calm emotions spell. cannot affect more HD then you have CL. (DoF)
Threesteel (3 wiz)- Touch one weapon and it splits up into three weapons, which instantly fire at a target, CL as BAB, deal weapon damage. It doesn't seem great until you combine it with Reach and Chain. (aaaah I didn't write down where I found this...)
BATTLE TIDE (5 cleric) this spell has got to be a mistake. You cause -2 on saving thros, attack and damage to CL amount of enemies, will negates. And as long as at least one person is affected by it, you get an extra partial action per turn. This spell becomes SILLY when you combine it with the 20 1HD skeletons in your bag of holding and DMM persist. (LoD)
Skin of the Steel Dragon (wiz 5)- spell resistence for the wizard! immediate action cast and last 1round/3 levels, but if you're using this spell you'll be persisting it. 10+CL. (CoV)
Champions of Ruin has some really strong spells for Archivists. And I mean ridiculous spells.
Arrowsplit (3 assasin, ranger, justice of weald and woe)- swift action split any arrow or bolt into 1d4+1 more. so you can full round attack with that splitting bow... then reach/chain/maximize the spell... and SERIOUSLY unleash some attacks. Sadly, only works on mundane projectiles.
Doublestrike Attows (4 ranger, justive of weald and woe)- allows you to attack an extra target with another attack roll. if you miss the first you still attack the second.
Shadow Arrow (4 assasin, ranger, justice of weald and woe)- swift action, arrow does 1d6 str damage. no save. once again, reach/chain! But once again, sadly, only works on mundane projectiles.
What spells have you found? And please, don't forget the spell levels and sources!
EDIT: New find:
Darkbolt from SpC. It's a Darkness 5 spell, which means in an Archivist spell. 2d8 blasting, will negates daze, and you can get up to 7 bolts. Bolts can be fired at once, or at any time after casting the spell as a free action. And there is no duration given for how long those last. If you're blasting all at one target they'll need to make 7 will saves.
Fantastic Machine (5 craft/gnome) in SpC is also worth looking at.