As this doesn't pertain to specifically melee oriented gear or mage oriented gear, it's been something that's rolled around in my head a while; equipment set bonuses.
For example, using current items:
Object 'rope climbing rope-climbing gloves' is type armor, material leather. Extra flags: magic. Weight is 0, value is 6000, level is 0. Armor class is 14 pierce, 15 bash, 12 slash, and 8 vs. magic. Affects hitroll by 2. Affects dex by 2.
Part of Climbing Set
Object 'spider-climbing slippers' is type armor, material leather. Extra flags: glow hum antineutral psienhance. Weight is 5, value is 8, level is 45. Armor class is 12 pierce, 9 bash, 9 slash, and 0 vs. magic. Affects damroll by 1. Affects dex by 3. Affects move by 100. Rare item.
Part of Climbing Set
The set bonus would then do something like:
You are affected by the following: Spell: Climb Set : modifies movegain by 10 permanently
Implement it on older gear, new upcoming gear, potential upcoming mage gear, whatever.
Possible set bonuses could include (but not limited to) hit/mana/movegain, +hp/mana/moves, additional saves, bonuses to spell duration, resistances to whatever, +hit/dam.
I just wanted to get that out.