After plenty of consideration, I decided to evolve myself 'Chitinous Carapace'. I was against it before. Then, it would've greatly decreased my ability and flexibility. Now, with 'Form Shifting' that allowed me to bend into pretzel if I wanted to, this wasn't my concern. And more protection was always better.
On level 10, I had to choose between 'Steel' and 'Spikes' upgrades, and after I chose the first option, I had to pick between 'Adamant' and 'Orichalcum'. A harder choice this time, since I had very little idea about what was the difference between the two. Good thing that I had my pocket encyclopedia.
'Pest, what's the difference between adamant and orichalcum? They are both metals, aren't they?' I thought I remembered something like that from my past life, or maybe Rosha had mentioned them…