Ghostly Orb
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From Diablo Wiki
Ghostly Orbs are objects.
Ghostly Orbs are a sort of monster generator, creating a wraith every few seconds until they are destroyed. They've only been seen once, in the WWI 2008 movie, when four of them emerge from the floor in a trapped room and begin producing Wraiths as soon as they are active.
It's not yet known if they can turn out wraiths indefinitely or have a set number they may generate. Nor is it known if wraiths are worth experience or can drop items when they come from a Ghostly Orb.
