1. Infinite Tsukuyomi - no explanation needed
2. Gudōdama (specifically Kaguya's) - given what we know of Ōnmyoden, this is quite possibly the most destructive attack in the manga.
3. Chibaku Tensei - depending on the caster, it can seal away deities.
4. Dimensional Shifting - if you don't have Kamui, you're boned
5. Edo Tensei - potential world conqueror
6. Kamui - greatest defense and a stellar offense
7. Limbo Hengoku - unless you have the Sage's power, you literally won't see this attack coming
8. Ōnmyoden - can destroy almost anything. Only weakness is Senjutsu and even then it can combat it
9. 8 Gates - can shatter a Juubi Jinchuriki, downside is it's a suicide tech.
10. Shinsūsenju - big ol Buddha
Imo
2. Gudōdama (specifically Kaguya's) - given what we know of Ōnmyoden, this is quite possibly the most destructive attack in the manga.
3. Chibaku Tensei - depending on the caster, it can seal away deities.
4. Dimensional Shifting - if you don't have Kamui, you're boned
5. Edo Tensei - potential world conqueror
6. Kamui - greatest defense and a stellar offense
7. Limbo Hengoku - unless you have the Sage's power, you literally won't see this attack coming
8. Ōnmyoden - can destroy almost anything. Only weakness is Senjutsu and even then it can combat it
9. 8 Gates - can shatter a Juubi Jinchuriki, downside is it's a suicide tech.
10. Shinsūsenju - big ol Buddha
Imo