I haven't actually worked on this
all that much as a project for publication; most of this material represents homebrew work I did for my table between 1995 and 2000. I've revisited it a few times since getting back into old D&D in 2010 or so.
When I was running AD&D in high school, I used
Skills & Powers and
Spells & Magic to customize the race/class rules for
every campaign.
Ancestry & Class
- Core ancestries are PHB/S&P standard, plus goblin/hobgoblin/bugbear.
- Hybrid ancestry is a human ancestral feature that can be selected/purchased.
- Classes are organized into groups like in 2e, including the Psionic group.
- Warrior: Cavalier (+Samurai), Soldier (Bushi), Swordsage, Swashbuckler (think PHBR 1&2), Ranger.
- Rogue: Thief, Bard, Assassin, Sapper
- Mage: Wizard (diviner + sage), Sorcerer (Elementalist/Wu Jen), Magician (illusion/mentalism/dimension), Witch, Warlock.
- Priest: Cleric, Templar (Crusader + Sohei), Shaman (+Shukenja), Druid, Healer.
- Psion: Mystic (Monk + egoist), Psychic (telepath + seer), Havoker (soulknife + PK).
- "Paladin" is something Warriors & Priests can become; Assassins and Rangers are optional minor spellcasters.
- Race/class restrictions are loosened but not removed entirely.
- Humans can multiclass better than other ancestries.
- Some ancestries have requirements in addition to restrictions, like elves being warrior/mages before they can be /rogues or /priests.
- Subraces are less of a thing and ancestral features are less standardized. I like to think my minor flavor changes are pretty cool.
Martial Arts
I have
never made this work, but the goal here is for the OA/PHBR15 martial arts system to coexist with "unarmed" weapon mastery and (even) more fantastic abilities from
Dragon Fist and
Flying Swordsmen. Players would buy these abilities with CP, based on their class and level.
Spellcasting
Just... read Chapter Six of
Player's Option: Spells & Magic and think about some of the alternatives to Vancian casting that have been developed since 3e. It's
trivial to adapt those rules for Wizard or Sorcerer casting, 5e prepared casting, or even further extremes like Sha'ir- or Warmage-style casting.
Psionics uses the "spellcasting" rules for spell lists and spells per day, but different mechanics than mage and priest spells. All psions are
strictly limited to their known spells.
Every spellcaster (class and individual) has Major access to some schools/spheres and Minor access to others. (Which determines spell point cost, not maximum spell level.) Each class has its own rules for known/prepared spells and fixed/free magick. Different classes might use some of the special spellcasting rules.
Mages and Psions have tighter restrictions on their spells but can poach from other classes in their groups. Priests are a lot freer with their class spells, but a lot more restricted outside of their class lists. Minor spellcasters get the worst of both worlds.