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How to Unlock Backlash Sword Skill | Echoes of Aincrad (SAO EoA)

How to Unlock Backlash Sword Skill | Echoes of Aincrad (SAO EoA)

Last Updated: July 21, 2026 at 1:39 PM
Table of Contents

Backlash Basic Information

Backlash
Weapon TypeTwo-Handed Sword icon
Two-Handed Sword
SP Cost100Cooldown70
DescriptionExecute a spinning Sword Strike that deals 170 (+150% of ATK) damage. Hold the attack button to charge up to three follow-up spinning slashes, dealing:
•190 (150% of ATK) damage on the first strike
•240 (150% of ATK) damage on the second strike
•340 (200% of ATK) damage on the third strike

Here is the basic information for the Backlash, showing its weapon type, SP Cost and Cooldown, description, and how to unlock it.

How to Unlock Backlash Sword Skill

sword skill levelling.jpg

Sword Skills, although being named as such, can be for different weapon types such as the rapier, dagger, and so on. Except for the defaults, you can unlock Sword Skills by simply increasing your weapon proficiency.

Backlash is unlocked by Two-Handed Sword Proficiency Lv. 5.

How to Increase Weapon Proficiency

Upon completion of the side quest, “Thrill of the Unknown,” you can increase your proficiency. You can then reallocate your Sword Skill points using your chest at the inn.

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