Requirement for jump attack: Agility 2
Requirement for jump attack II: Strength 4, Agility 3
Jump attack: While in the air, your stun bonus increases by twice the number of wall jumps you've performed, plus two.
Jump attack II: Normally, if you attack in the air, you get stunned for 1.4 points upon landing. With this perk, that stun is reduced to one point.