Baleful Polymorph work as per page 202 of the D&D 3.5 edition players handbook.
Level: Drd 5, Sor/Wiz 5
Components: V, S
Casting Time: 1 standard action
Range: Close (25 ft. + 5 ft./2 levels)
Target: One creature
Saving Throw: Fortitude negates, Will
partial; see text
Spell Resistance: Yes
You change the subject into a Small or
smaller animal of no more than 1 HD (such
as a dog, lizard, monkey, or toad). The
subject takes on all the statistics and spec-
ial abilities of an average member of the
new form in place of its own except as
o The target retains its own alignment
(and personality, within the limits of the
new form’s ability scores).
o If the target has the shapechanger
subtype, it retains that subtype.
o The target retains its own hit points.
o The target is treated has having its nor-
mal Hit Dice for purpose of adjudicating
effects based on HD, such as the sleep
spell, though it uses the new form’s base
attack bonus, base save bonuses, and all
other statistics derived from Hit Dice.
o The target also retains the ability to
understand (but not to speak) the langu-
ages it understood in its original form. It
can write in the languages it understands,
but only the form is capable of writing
in some manner (such as drawing in the
dirt with a paw).
See Errata for more.