@meko Yes I do have the most recent Hercules version. For my test server I used rAthena but decided to move to Hercules because of the support it gives for plugins. I did try it however every time I set to increase the HP of a monster it doesn't work.
 
	 
 
prt_fild08,50,50,4	script	IncreaseHP	93,{
  
  mes "I will increase the HP of the monster that I summon";
  set .mob = monster("prt_fild08", 50, 50, "CYBORG 123", 1002, 5, "IncreaseHP::On_Summon");
  .mob;
  close();
  
On_Summon:
  setunitdata(.mob, UDT_HP, 100000);
  end;
  
  
}