For the purposes of the Two-Weapon Defense feat in particular,
Two-Weapon Defense [General]
Benefit: When wielding a double weapon [...] you gain a +1 shield bonus to your AC.
It doesn’t get any more explicit than that.
Ambidexterity was a feat in 3e, which was removed from the game in 3.5e. It is no longer necessary at all; its benefits ...
Prepare incarnation of evil
Spells That Have Come Before, in part, says "For the purpose of adjudicating effects that apply to polymorph spells, any spell whose effect is based on either alter self or polymorph should be considered to have the polymorph subschool" (Player's Handbook II (May 2006) 96 and here).
This means that a cleric can prepare the 5th-...