Here's a metamartial ability (metamartial abilitites are listed on page 124-125)
Maximize Attack
Prerequisites: +10 Base Attack Bonus
Benefit: You automatically deal maximum damage if you hit. This applies to sneak attack damage (if any), but not bonus damage dice from things like the Flaming Weapon ability or the various Strike effect powers. You take a -10 penalty on your attack roll
Maximize Attack
Prerequisites: +10 Base Attack Bonus
Benefit: You automatically deal maximum damage if you hit. This applies to sneak attack damage (if any), but not bonus damage dice from things like the Flaming Weapon ability or the various Strike effect powers. You take a -10 penalty on your attack roll