Spell School Focus

SPELL SCHOOL FOCUS [General]
Select one spell school.

Prerequisite: Ability to cast spells, character level 1st.

Benefit: You gain a +1 bonus to DCs and your effective caster level for spells from your selected school.

Special: This feat can be taken multiple times; its effects can stack or apply to a new school. Each time it is taken, its character level prerequisite increases by 5 for the purposes of stacking but not for selecting a new school.

Comments
The original Spell Focus feat is hardly beneficial and overly focused.