Hide a mob, dehide the mob when killed ?

[Auryn]

I would like to spawn treasure boxes, I make them like under the floor.

The player will be albe to hit it if he points his cursor on it, and see the kill animation.

How could I do it ?

[Nameless2you]

you could make a no-sprite mob and spawn that, but that's only a thought, not sure if it'll actually work, else there's that lighthalzen mob that's tiny and really hard to see depending on the terrain.