Funny enough, I posted a Runesmith thread just today:
http://boards1.wizards.com/showthread.php?t=533572
I am wondering if there is a flaw in this build that I am not noticing.
Runesmith 1 (from Races of Stone) grants the Rune Magic (Ex) ability. It allows the Runesmith to prepare his spells on a small tablet, removes the somatic componant from the casting, and adds the tablet as a material componant. "In all other ways, spells prepared in rune form are treated identically to spells prepared in the normal method."
Runesmith 3 grants the Share Runes (Ex) ability."[A] runesmith can prepare a limited number of rune-form arcane spells such that they can be activated (cast) by any character. The spell's castint time remains the same, and it is just as effective as a spell cast by the runesmith himself. The spell's level is in creased by two, much as if a metamagic feat had been applied to it." There are other details, such as the number of times you can do this/day is your Con modifier, and it uses your spell slot when you share the rune.
Incantatrix 2 (Player's Guide to Faerun) grants the Cooperative Metamagic (Su) ability. It allows the Incantatrix to "...apply any metamagic feat she possesses to a spell being cast by a willing allied spellcaster...modifies the spell during the casting...must make a Spellcraft check (DC 18 + [3 x modified spell level]) to succeed."
The Persistant Spell feat (Player's Guide to Faerun) changes any spell with a range of personal and a non-instantaneous duration into a 24 hour duration. It increases the spell level by 6.
Wraithstrike (Complete Adventurer) is a 2nd level Wizard spell with a Personal range and a 1 round duration that makes your melee attacks into melee touch attacks.
So, couldn't the Runesmith 3/Incantatrix 2 with the Persistant Spell feat make runes of Wraithstrike (using your 4th level spell slots, making enough to cover an average sized party fairly easily since Con is a useful stat for a spellcaster), give them to the other party members, have them use the rune while you use your Cooperative Metamagic ability, make a DC 48 spellcraft check (obviously not an easy check by manageable if built right), and turn the Wraithstrike durations into 24 hours?
This would of course work with many other spells for the rest of the party and yourself as well.
Plus you can wear armor while casting all your spells, making an okay Gish if combined with other common Gish build ideas.
Is there an easier way to do this and I am just overthinking things? Or is this a plausible optimized build that can buff the entire party with 24-hour powerful spells?