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I've had this for a while, and I've finally wanted to release it for those newer RPG servers looking for a spell system. I'm not sure how much more efficient this is over other means of doing it, but it's a start and is documented for easily changing it.

In a weapon given to everyone called "-System/Spells" or similar (which will require that you change all "-System/Spells" to whatever you name it):

PHP Code:

function onActionServerside(cmd,p1) {
  if (cmd == "TakeMana")
    mana.flag.here -= p1; //input wherever you store the mana flag at 'mana.flag.here'
}
//#CLIENTSIDE
public function fireSpell(stats) { //fired from the spell weapon
  temp.spellName = stats[0];
  temp.action = stats[1];
  temp.cast = stats[2];
  temp.ani = stats[3]; //projectile
  temp.mana = stats[4];
  temp.freeze = stats[5];
  temp.power = stats[6];
  temp.cooldown = stats[7];
  
  if (mana > mana.flag.here) { //input wherever you store the mana flag at 'mana.flag.here'
    player.chat = "You don't have enough mana to cast " @spellName@ "."; //if you have a message system you can use that instead
    return;
  }
  if (this.("cooldown_" @spellName) != null) {
    player.chat = spellName@ " is still cooling down for " @this.("cooldown_" @spellName)@ " seconds."; //if you have a message system you can use that instead
    return;
  }
  
  if (action == "hurt") { //a spell that hurts a player
    if (cast == "projectile") { //a hurt spell that is a projectile
      freezePlayer(freeze);
      setAni("grab",null); //placeholder
      sleep(freeze);
      setShootParams("spell","hurt",power);
      temp.angle = getAngle(vecx(player.dir),vecy(player.dir)); //shoots in a straight line
      shoot(player.x+vecx(player.dir),player.y+vecy(player.dir),player.z,angle,1,0,ani,null);
    }
  }
  if (action == "heal") { //a spell that heals a player
    if (cast == "projectile") { //a heal spell that is a projectile
      freezePlayer(freeze);
      setAni("grab",null); //placeholder
      sleep(freeze);
      setShootParams("spell","heal",power);
      temp.angle = getAngle(vecx(player.dir),vecy(player.dir)); //shoots in a straight line
      shoot(player.x+vecx(player.dir),player.y+vecy(player.dir),player.z,angle,1,0,ani,null);
    }
    if (cast == "self") { //a heal spell that is cast on yourself
      freezePlayer(freeze);
      setAni("grab",null);  //placeholder
      sleep(freeze);
      //go to health system and heal using the amount 'random(int(power[0],power[1]))'
    }
  }    
  triggerServer("gui","-System/Spells","TakeMana",mana);
  makeVar("this.cooldown_" @spellname) = cooldown;
  scheduleEvent(0.05,"Cooldown",spellName);
}

function onCooldown(spellName) {
  if (this.("cooldown_" @spellName) > 0) {
    makeVar("this.cooldown_" @spellName) -= 0.05;
    scheduleEvent(0.05,"Cooldown",spellName);
  }
}

function onActionProjectile(spell,action,power) { //when being hit by a projectile
  if (spell == "spell") { //make sure it's a spell and not some other projectile
    if (action == "hurt")
      //go to health system and damage using the amount 'random(int(power[0],power[1]))'
    if (action == "heal")
      //go to health system and heal using the amount 'random(int(power[0],power[1]))'
  }
} 


In spell weapons that are added from being bought/learned (I'm using "Barrel" as an example; these have to be able to be fired [D] or create your own way for firing them):

PHP Code:

//#CLIENTSIDE
function onWeaponFired() {
  temp.stats = {
    "Barrel", //name
    "hurt", //action
    "projectile", //cast
    "woodenbarrel", //projectile animation
    20, //mana
    2, //freeze
    {1,5}, //power
    5, //cooldown
  };
  findWeapon("-System/Spells").fireSpell(stats);
}