[The only other secondary upgrade you can purchase in this loop, is the spiky iron spine ability.] The lady in his head, notified.
Afterwards she stated, [You need to spend four-hundred system points, in order to unlock it.]
The main goal was to buy this particular upgrade on the list, just so he could get to the more important ones. Specifically, the types which were based on intelligence!
If it meant that he had to spend a few hundred points, then so be it. He had a whole lot of points to spare for once, even though he wasn't entirely pleased with the total sum.
Anyway, the current available upgrade sounded useful enough, so William didn't have to complain for once. He could already think of a way, where such an ability could be merged with another attribute, for them to cooperate. Efficiency was key for such a matter.