Weapon and Armor Proficiency: Tempests gain no weapon or armor proficiencies.

Improved Two-Weapon Fighting: Beginning at 1st level, a tempest can fight with two weapons as if she had the Improved Two-Weapon Fighting feat when she is wearing light armor or no armor. She loses this ability when fighting in medium or heavy armor, or when using a double weapon (such as a two-bladed sword).

Off-Hand Parry: At 2nd level, the tempest gains Off-Hand Parry as a bonus feat. As she gains tempest levels, her AC bonus from this feat increases, rising to +4 at 4th level and to +6 at 6th level.

Greater Two-Weapon Fighting: At 5th level, a tempest can fight with two weapons as if she had the Greater Two-Weapon Fighting feat when she is wearing light armor or no armor. She loses this ability when fighting in medium or heavy armor, or when using a double weapon (such as a two-bladed sword).

Absolute Ambidexterity: Beginning at 8th level, the tempest's attack penalties for fighting with two weapons lessen by 2 when she is wearing light armor or no armor. Thus, if she fights with a light weapon in her off hand, she suffers no penalties on her attack rolls for fighting with two weapons. (If the off-hand weapon is not light, she suffers a —2 penalty on attack rolls with both her primary hand and her offhand.)

Supreme Two-Weapon Fighting: At 10th level, a tempest gains an additional attack with her off-hand weapon when she is wearing light armor or no armor. In addition to the three attacks she already has each round with her off-hand weapon (for Improved Two-Weapon Fighting and Greater Two-Weapon Fighting) at penalties of 0, —5, and —10, respectively, she is also entitled to a fourth attack with her off-hand weapon at a —15 penalty (see Table 8—2: Two-Weapon Fighting Penalties in the Player's Handbook). She loses this special ability when fighting in medium or heavy armor, or when using a double weapon (such as a two-bladed sword).