EX Skill

EX Skill (EXスキル) is a system from the Mega Man Zero series.

Zero's Skills
The EX Skill system was introduced in Mega Man Zero 2. When Zero defeats a boss while having rank A or S (or with a weather favorable to the boss in Mega Man Zero 4), Zero will learn a new ability that can be used with his weapons.

Bosses
The name EX Skill also refers to the extra attack used by bosses when Zero fights against them with a Rank A or higher. Most of these Bosses' EX Skills are the basis for Zero's own versions.

Trivia

 * The name of the Mega Man Zero 2-4 bosses EX Skills were mistakenly replaced by Zero's EX Skills in the English version of Mega Man Zero Official Complete Works.