Cyclone

«Cyclone» (サイクロン), also known as Whirling Current (輪渦), is a 1-hit Two-handed Straight Sword category Sword Skill in Sword Art Online, New ALfheim Online and Project Alicization.

Description
Cyclone is activated by the user holding their sword with both hands at the right of their waist. The skill is a two-handed spinning sword slash that consists of a single upwards diagonal slash from right to left with two hands holding the sword.

Trivia

 * Although the skill is a one-hit skill, if used against Avalanche properly, the skill can be deflected in a way that the sword returns to its original location, causing the skill to reactivate and thus create a second hit.