Gnorman's Complete E6 Compendium

[Gnorman]

I would suggest having that be a "generic" mage thing, not sure if it would work for the existing model. But feel free to try.

Yes, it would require some pretty heavy revamps of the existing mage classes. Although it wouldn't be too bad - you remove their list, and then say, for example, "The black mage has access to four of the following spheres, chosen at 1st level: Charm, Chaos, Corruption, Curse, Destruction, Fiends, Fire, Necromancy, Lifetheft, Summoning, and War." The archetype would add in a fifth.

More brainstorming...

Animal
1: Charm Animal, Speak with Animals
2: Animal Messenger, Hold Animal
3: Dominate Animal, Greater Magic Fang

Charm
1: Charm Person, Command
2: Calm Emotions, Daze Monster
3: Hold Person, Suggestion

Divination
1: Detect Secret Doors, Identify
2: Locate Object, See Invisibility
3: Arcane Sight, Clairaudience/Clairvoyance

Necromancy
1: Chill Touch, Detect Undead
2: Command Undead, Ghoul Touch
3: Animate Dead, Halt Undead

Plant
1: Detect Animals or Plants, Entangle
2: Barkskin, Tree Shape
3: Diminish Plants, Plant Growth

Time
1: Expeditious Retreat, Hold Portal
2: Blur, Protection from Arrows
3: Haste, Slow

Wards
1: Protection from Alignment, Sanctuary
2: Arcane Lock, Find Traps
3: Glyph of Warding, Magic Circle Against Alignment

Weather
1: Endure Elements, Obscuring Mist
2: Gust of Wind, Fog Cloud
3: Sleet Storm, Wind Wall