Hello, you have to specify as soon as possible Charmed Ones have resistance against what? Or differently your edits will be cancelled. And please don't confuse resistance with immunity. You need try to be as specific and attentive in your edits in the future. Thank you for listening.
Help is good, but you are a little confused one power with another power. The sisters have no resistance, but immunity to Sirens' songs and to Pixie Dust. Immunity is a more powerful version of Resistance. I hope you realize it now ^_^