From the Super Mario Wiki
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Final Edge is the Mii Swordfighter's Final Smash in Super Smash Bros. for Nintendo 3DS / Wii U. When activated, the Mii will hold their sword up and fire several crescent-shaped energy blasts in the direction they are facing, dealing repeated damage and pushing any opponents caught in the blasts back. The energy blasts are spread out and can also fly through walls and obstacles.