É..
A skill era para dar 25% mesmo..
Skill heavy armor mastery dos orc:
http://base.l2j.ru/img/icons/skill0253.png Heavy Armor Mastery +20 Power
When equipped with heavy armor, increases P. Def. by 93.3, Casting Spd. by 71%, and Atk. Spd. by 27%. Enchant Power: Increases Atk. Spd.
Skill light armor mastery dos orc:
http://base.l2j.ru/img/icons/skill0252.png Light Armor Mastery lvl.45
When equipped with light armor, increases P. Def. by 118.2, Casting Spd. by 90%, Atk. Spd. by 25%, and MP Recovery Bonus by 20%.