Get a number in Commands

  var _Game_Interpreter_pluginCommand = Game_Interpreter.prototype.pluginCommand;
  Game_Interpreter.prototype.pluginCommand = function(command, args) {
      _Game_Interpreter_pluginCommand.call(this, command, args);
      if (command === 'Setting'){

        switch (args[0]) {
          case 'ad':
             return ad = Number(args[1]);
          break;
  }
 }

/*:
BM_Difficulty.js
Version: 1.0

@plugindesc Adds difficulty through parameter manipulation.
@author Bloodmorphed

@help
Plugin Commands:



*/

(function() {

  function toNumber(str, def) {
      return isNaN(str) ? def : +(str || def);
  }



  var parameters = PluginManager.parameters('BM_Difficulty');

  // Param Multipliers
  var dhp = toNumber(parameters['Max HP Multiplier'], 1); // Max HP
  var dmp = toNumber(parameters['Max MP Multiplier'], 1); // Max MP
  var dap = toNumber(parameters['Attack Multiplier'], 1); // Attack
  var ddp = toNumber(parameters['Defense Multiplier'], 1); // Defense
  var dma = toNumber(parameters['Magic Attack Multiplier'], 1); // Magic Attack
  var dmd = toNumber(parameters['Magic Defense Multiplier'], 1); // Magic Defense
  var day = toNumber(parameters['Agility Multiplier'], 1); // Agility
  var dlk = toNumber(parameters['Luck Multiplier'], 1); // Luck
  var exp = toNumber(parameters['EXP Multiplier'], 1); // EXP
  var gold = toNumber(parameters['Gold Multiplier'], 1); // Gold
  var params = [dhp, dmp, dap, ddp, dma, dmd, day, dlk]; // Parameter Array

// End 'noob friendly' Customization
  var _Game_Interpreter_pluginCommand = Game_Interpreter.prototype.pluginCommand;
  Game_Interpreter.prototype.pluginCommand = function(command, args) {
      _Game_Interpreter_pluginCommand.call(this, command, args);
      if (command === 'hp'){ return dhp = Number(args[0]) }
      if (command === 'exp'){ return exp = Number(args[0]) }


  }; // end pluginCommand

  // Gold calculations
  Game_Enemy.prototype.gold = function() {
    var esg = this.enemy().gold;
    var gdifficulty = Math.round(esg * gold);
    return gdifficulty;
  }; // End Gold

  // EXP Calculation
  Game_Enemy.prototype.exp = function() {
    var ene = this.enemy().exp;
    var edifficulty = Math.round(ene * exp);
    return edifficulty;
  }; // End exp

  // Param Calculation
  Game_Enemy.prototype.paramBase = function(paramId) {
    var enp = this.enemy().params[paramId];
    var pdifficulty = Math.floor(enp * params[paramId]);
    return pdifficulty;
    }; // End paramBase

})();