One again I am in the theory mood, and what better time than to compare characters like it's a death battle? (Without the really precise math and the cool fight scene.)
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Alrightly, for this prediction i have colaberated with Elite_Lucario, and we will be using the characters in his 2019 Dec 5th tier list, who are Erza, Ember, Alizia, Lightstar, and Senee. I have chosen Alizia and Lightstar.
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Alizia: Alizia's powers include levitation of objects and communicate with spirits, as well as good skill with a switchblade knife. It has been hinted that she has some sort of dark magic manipulation, most likely part of her heritige, in which her father is the mage of darkness. According to Monochrome_Colorbars, Alizia's strongest attack is the Dark Magic Knife Tornado, which was used in an unknown part of the roleplay. Now with the this-is-as-close-as-your-going-to-get-cause-i'm-not-a-master-scientist-math. The avarage speed of a tornado is 30 MPH, and can escalate to 70 MPH. We are going to use 70 as the avarage speed of the attack. A the knife is most-likely a pound, and with the simallarity of a bullet, the force would be 16000 newtons of force. Now just imagine hundreds of sharp, razor knifes and a tornado. The derbis the attack threw up would most likely be the same force to.