Omnislash

Omnislash is an ability only available to Cloud in all of the Kingdom Hearts games. It is based on his ultimate Limit Break in the original Final Fantasy VII, and the attack's upgraded form in Final Fantasy VII Advent Children. It is also famous as Cloud's finishing (and only) move during the staged battle against Sephiroth after beating the latter in the final battle, regardless of whether Cloud acquired the Limit Break in-game or not.

Kingdom Hearts
Cloud uses this ability during tournament matches against Sora and friends. First he says the words "Farewell" and grows a wing and flies across the field hitting random characters. He also uses this ability when he fights Sephiroth in the Final Mix version.

Kingdom Hearts: Chain of Memories
In Kingdom Hearts: Chain of Memories, when Sora stocks three Cloud Summon cards, Cloud uses this attack on enemies. The ability makes the Cloud swoop down from the heavens, attacking enemies in a wide area.

Kingdom Hearts II
This version of Omnislash is set as his Omnislash Version 5 from the CGI movie Final Fantasy VII Advent Children, but was mistranslated as Warrior Spirit in the English version. Cloud says "Farewell" as in the first game, but he circles the entire field attacking a series of times on Sora then finally lands on the floor causing a explosion and catches his sword in the attack's end. Cloud also uses this ability when he joins Sora as a guest at Hollow Bastion and in it's starting point at the end of the battle with Sephiroth. Despite being designated as "Omnislash Version 5", the First Tsurugi sword does not disassemble like it does in the movie due to the fact that the First Tsurugi is bandaged in its assembled form.