I think it would be about LV20+ Although I am not sure because I have LV107 SSR Riddle (dorm uniform,it isn't really mine also😂) so I whooped his a$$. Also use water cards and get strong water support cards from a friend (such as Kalim SSR dorm uniform or Azul SSR Dorm Uniform/you have Vil's SSR silk adorned card too) because that will give you a huge boost Also make sure to enhance your spell levels,those really help.
14:38 I dont play this game but why the HELL does CATER NOT BECOME SERIOUS FOR ONCE LIKE GEEZ DUDE SOMEONE COULD DIE RIGHT NOW IN FRONT OF UR FRICKING EYES.