I play a really old MMO called hero online, now called Hero plus

Anyways to cut this short. There is a map where you can kill mobs of monsters.
Now in these mobs of monsters there is a rare monster that drops rare gear. He looks exactly the same as all the normal monsters. So no one knows when hes spawned. HE usually spawns 12 hours from when he was killed.


There are 3 of them and was wondering if its possible to either hide the normal mobs and just show the rare monsters, or code something to show which one is the rare mob out of all the normal mobs since he looks identical to the normal monsters.

Thanks.