Quote Originally Posted by hungrycrow View Post
Spoiler: manga
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Demon Tanjiro overcame the sunlight weakness though.
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Immune is a strong word, even a demon like Nezuko who was immune to the suns light on its own would still die when beheaded with one of the special swords. By that logic, Hamon would probably also be able to effect them. Although it might be less effective, one thing Jonathan was never short on was overwhelming might.