After going to the bathhouse I brought Ki'rei some food from the cafeteria and when she finished I went to return the bowl, and stand in line to use the device. I was relatively early, so I didn't have to wait long for my turn.
I started by upgrading the monk's 'Mind mastery' since I needed something to fight of their strange skills, and the description I had in my head from the manual, was indicating just that. I maxed it for 11 million points. Then I upgraded my wisdom a hundred times, which I immediately regretted.
It felt like somebody whacked my brain with a stick. Skull-splitting pain, which I endured squinting my eyes, and went straight back to shopping.
With that, I felt confident about my resistance to mind shenanigans, but there was still the boss part. I was sure it wasn't gonna be as bad as it was yesterday since I knew what I needed to be wary of.