When it rains or is very humid, you should think very carefully whether and from where you want to come up here! There is a clear warning on the southern ascent from the geothermal field, unfortunately not on the northern one.
The floor is covered a few centimeters with a clay-like gray-brown slush, and underneath there is something lighter, grit-like. Now, when wet, the top layer tears off and sticks to the shoe. You soon have 1-2 kilos of ballast that prevents any grip. As long as you walk on "untouched" terrain, you can still do that. After that, however, the worn piece is like soft soap! I suspect that the top layer comes from the volcanic eruption a few years ago, which massively restricted global air traffic for a long time?
We used the northern approach to climb. That was a bit annoying in the rain, but doable. The descent on the southern side was criminal!
The path got steeper and steeper. We tried the descent and were surprised how easy it is - you slip a bit with every step, but at first it was manageable. One or two really steep passages demanded everything from us, but they were short (only a few meters). But now there was no turning back! And it was getting nastier, because now it went (when the rain got stronger again) across the slope and the "path" hung to the right - with every step you almost made a tackle! That increased even more, with even steeper passages, etc. - but luckily only over relatively short stretches. I also had to dig into the dirt one time or the other, which I never actually do. When we got down there happily, we found a sign with a clear warning - if only there had been such a sign on the other side!