Needs review
Source: Dragon Magazine #351

Description: Your intense concentration allows you to enhance a spell you cast from your school of specialization.

Prerequisites: Arcane Focus, 1st Level Specialist Wizard

When you expend your arcane focus, you may select one of the following three benefits.

Spell Boost: The next spell you cast from the school you specialize in in the next round is cast at your spellcaster level +1.

Spell Endowment: The next spell you cast from the school you specialize in in the next round has its saving throw DC increased by +1. This bonus stacks with those from the Spell Focus and Improved Spell Focus feats.

Spell Intensity: The next spell you cast from the school you specialize in in the next round gains a +2 bonus on any level check made to overcome spell resistance.