Adding magic or physical damage bases

Well since theres wizards and such, can you add the magic and physical based damage and also for the AC can you add a feature where you can tap and hold on AC to see how much damage you’re reducing and also add something for intelligence to basically have something like “AC vs magic attacks” we all know melee attackers are strong vs physical and weak vs magic and vice versa for mages, if you’re gonna have an RPG like this, might as well add those mechanics to it, and if you wanna get real in depth add things like spirit damage and other elemental damages and add saves vs such attacks for reduced damage, you want to make a DnD game, let’s make one