<defense name="invisible" interval="6000" chance="1000">
<attribute key="areaEffect" value="blueshimmer"/>
</defense>
I've never played Diablo, so I cannot try to help you.
Maybe a detailed description of what you want?, never played diablo either and your description says nothing.
perhaps drops gold coins or donor currency each time it loses hp? (and maybe it has 20 hp, and no matter how hard its hit for, it takes 1-2 dmg per hit?)
cause i believe the treasure goblin in diablo drops gold each time it is attacked.
also, i really like the idea of this!