Appears at a 33% chance when you fail to visit the Central Mountain and pass away
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Dialogue:

Woahsie! You have passed away doing your quest to visit the central mountain

Since this is your own quest, I will help you.

But as I say, If you pass away again, you'll die in the emptiness after I take your soul.

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When you pass away after Taskoingo appears last time, you'll get a "Game Over Screen" from Chu-Teng, restarting your game for awhile.