From Dragon Mania Legends Wiki
Vengeful Sword can be learned by all Dragons with the Metal Element. It is an active defensive skill that applies a positive status effect by retaliating against attackers. It is triggered by both direct and indirect damage.
This skill can be used multiple times by the same caster, but only the duration is prolonged. However, it is stackable when used by different casters. The same principle applies to both of its masteries.
All allies get a defensive aura that retaliates against direct and indirect attacks. Target ally gets primary defensive aura, all other allies get secondary defensive aura. Skill effectiveness is based on caster's Dragon's Attack Strength (DAS).
Primary aura deals 125% DAS to a direct attacker and 40% DAS to an indirect attacker; secondary aura deals 50% DAS to a direct attacker and 30% DAS to an indirect attacker and the trained secondary effect occurs:
|En Garde!||Primary aura absorbs 20% DAS incoming damage.|
|Final Vengeance||If a target with primary aura is defeated, deals 80% DAS damage to all enemies.|