Talk:SAO Fanon Skills/@comment-2182964-20200211093352/@comment-2182964-20200211232434

Seen Nihontō. It fits the bill as a «Composite» Skill because it needs both One-handed Curved Sword and Katana completed to use. If you removed one from your skill list you'd lose access to Nihontō, as a removed Skill loses all proficiency.

Composites are a combination of Skills that yield additional effects/skills. They get a mention in Sugary Days 6. The downside is that they aren't listed by the system -- players had to mix and match to find them, but by the end of 2024 Kirito was convinced whatever combinations had been found; that was until they found a player who could make balista, though.

An example in canon is the Sword Skill.

«Flail» isn't a Composite in the traditional sense. It's similar to the «Chakram» from Progressive, but it still needs a combination of equipped Skills to use, hence why I described it as such.