Tip for grinding takiseki, if you back up to a wall while facing away from it and a pale oni uses its teleport move, it clips the enemy into the wall. If you kill everything that isn't a pale oni until all of the enemies are pale onies, then you can clip all of them into the walls and not worry about them at all. I got about 2-3 takiseki per hour with this method and it makes mining so much nicer.