Eternal Arms Mastery (Anti-Demon) (無窮の武練（対魔）, Mukyū no Buren (Tai-ma)?)
| Rank | User(s) |
|---|---|
| A- | Watanabe-no-Tsuna |
| So long as his opponent is demonic, his swordsmanship will not waver in the slightest. He is an expert against oni and demons...but due to certain circumstances, this skill has been slightly downgraded. |
| Servant Skills |
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