I'm the Villain, but Is It Really Too Much to Know a Little Physics and Magic?

[Death rewind + System + firearm upgrades + powerful male and female leads and villains + pocket dimension + I don’t know what else to add.] The villainous archmage Bai Shenshen sought to destroy the world, but was killed by the forces of good. When she woke, she had become a rookie mage, armed from the start with a sniper cannon. Bai Shenshen physically destroyed her enemies, let firearms cover her back, and boosted her damage with verbal takedowns. In the end, she became an amazing archmage who slaughtered her way through countless foes. Later, Archmage Bai Shenshen gave an interview. “What is your ideal?” “Physically destroy all of humanity and let villains rule the world.” “And your motto?” “Magic is within firing range. Truth comes from the fist. Just get it done.” “Wait, you’re saying this is a System?” “A System? What System? This is magic, pure physical magic, chemical attacks, and firearms for support, with an unlimited rewind mode to keep me safe. Knowledge changes the world. Is that really so hard to understand?”