Re: Decreased Mana Costs as an advantage
I've been leaning towards making the "skill based" energy discounts for spells depend on CPs spent rather than actual skill level (so with 2 CP in a spell, you get a 1 FP discount, at 4 CP you get a 2 FP discount, etc.), and with that system the college "bang" skills provide explicit broad based cost discounts for colleges, and then I can extrapolate backwards from 1 college magery and swag it to ... something like this:
Reduced Mana Cost (10/30/+40 CP)
Spells cost 1 mana point less than usual for 10 CP, 2 mana less for 30 CP, and 3 less for 70 CP (40 more for each additional level).
This is not cumulative with the skill based discount - use the higher value.
Half cost to apply this to a single college, two thirds to apply it to 2 or 3 colleges.
One thing I like about this implementation is that it makes a small discount cheap, but steeper discounts hurt. It seems like that sort of trait. (High levels look to be dangerous to game balance, whatever that is.)
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