Improved Assume Supernatural Ability( Savage Species, p. 35)
You gain skill with using a supernatural ability of an assumed form.
Assume Supernatural Ability (SS) , WIS 17, ability to assume a new form magically,
This feat functions like Assume Supernatural Ability, except that you do not take the -2 penalty on all attack rolls, saves, skill checks, and ability checks when using it.
You can take this feat multiple times, but you cannot apply it more than once to the same special ability. Each time you take this feat, it applies to a different special ability.