I failed Ninja Tower on level 46. Is battle items a strict requirement?

Here is my heroes: https://heroplan.io/user/link/13e61e9e-d07f-4319-adf2-2aa066fe3c76
I lost almost all to Oni Stones by level 46.
But I had (and used) only 16 tornadoes and 16 dragon attacks.
Is I need 100 dragon attacks and tornadoes for December?

A post was merged into an existing topic: :japanese_castle: [Oct 2020] Ninja Tower Event - FAQ & Discussion

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