Need help locating a prestige class.

[Ethelesin]

So recently, i've been messing around alot with prestige classes and builds, gishes in particular and there is a class i've been trying to dig up, problem is, i cant for the life of me remember anything about the class except that;
The character art is some lady in a trenchcoat with a sword.
The class advanced spellcasting(?)
Class features included something about boosting a spell that summoned a spectral horse or sommat.

Any help at all would be appreciated. Thanks!

[claypigeons]

So recently, i've been messing around alot with prestige classes and builds, gishes in particular and there is a class i've been trying to dig up, problem is, i cant for the life of me remember anything about the class except that;
The character art is some lady in a trenchcoat with a sword.
The class advanced spellcasting(?)
Class features included something about boosting a spell that summoned a spectral horse or sommat.

Any help at all would be appreciated. Thanks!

Spellsinger?
Knight Phantom?

[Ethelesin]

It's the Knight Phantom, you sir, are my hero. Thanks, was pulling my hair out over this one.