Some ideas as to what focusing in a school could do for some spells...
Stoneskin: focusing in Abj could increase the +5 reduction and increase the dmg cap.
Example:
Focus = +6 reduction, 125dmg cap
GFocus = +7 reduction, 150dmg cap
EFocus = +8 reduction, 175dmg cap
Greater Stoneskin: focusing in Transmutation could do same as above.
Example:
Focus = +6 reduction, 200dmg cap
GFocus = +7 reduction, 250dmg cap
EFocus = +8 reduction, 300dmg cap
Premonition: focusing in Divination could increase the +5 reduction and give bonus to the 10dmg/lvl amount
Example:
Focus = +6 reduction, 12dmg/lvl
GFocus = +7 reduction, 14dmg/lvl
EFocus = +8 reduction, 16dmg/lvl
Direct Damage spells in general could have an increase in their dmg/lvl as well.
Focus in Necro for Horrid Wilting for example:
Base = 1d8
Focus = 1d10 or 1d8+2
GFocus = 1d12 or 1d8+4
EFocus = 2d8 or 1d8+6
BullStr, Cat's, Endurance, etc.
For each focus feat in Transmutation the bonus ability amount increases by 1.
BullStr Example:
Base = 1d4+1
Focus = 1d4+2
GFocus = 1d4+3
EFocus = 1d4+4
Will think of more later, gotta go eat some dinner now



