Type: Wild
Source: Complete Champion
By channeling the spirits of all creatures, you can increase or decrease your size without otherwise changing your form.
Prerequisite: Wild shape class feature, ability to assume the form of a Large creature using wild shape.
Benefit: You can spend one daily use of your wild shape ability to either grow or shrink one size category. You cannot use this feat multiple times to grow or shrink more than one category beyond your normal size, nor does this effect stack with others that change your size. You can activate this feat only while in your normal form. This supernatural ability otherwise functions as the spells enlarge person and reduce person (caster level equals your character level).