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Obsidian Ordeal

Kill 50 Obsidian Warriors and 50 White Bison, then speak to Minogame.
 

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Introduction

As expected, the Obsidian Turtle is in his domain. According to Roshi, even the Obsidian Turtle has succumbed to the same mysterious power as the other Guardians. He isn't sure where in Obsidian Turtle Pool it is, but said that Minogame may have more information. It will take some convincing to get him to help you, though...

NPC Dialog

Oh, I see, that is quite an interesting story! The
Obsidian Turtle has been acting quite strange
recently. Yes, he is usually quite modest and
reserved, but he has become quite nasty indeed. If
what you tell me is true, then this is just like what
happened to the other Guardians. Yes, yes, you
must find him! He is around here somewhere, but I
don't know where exactly. Minogame should know,
yes, but he's none too friendly to outsiders. We've
recently had an infestation of certain unpleasant
creatures, though, so he might be willing to help if
you can clear them out for us.

Quest Completion

What is it? Why did Roshi let you in here? That
senile old fart... I swear, if it wasn't for me, this
place would...
What was that? You got rid of the
White Bison and Obsidian Warriors? I guess the old
man did something right for a change. Perhaps you
can help me.