What exactly are the Monk's (and other classes) gods and spirits? When we go to the High Heavens, we only see angels and such. It's possible, one supposes that say Ytar is an angel or non-existent, but both Monk and Witch Doctor both get (or believe they do) get their powers from said beings. One could say that perhaps they're just channeling their nephelim powers (they being the first generation born after the worldstone's destruction), but then where did their predecessors get their power. And it still doesn't explain who beings like Ytar actually are.