I’ve been maxing GraveDigger and I got up to 40 in mythical … and I stopped there.
Those legs are not useful for me. I lose almost 100 points of HP. In the very remote case that I get to use them, I move away from my opponent 2 places, which does not suit my phys. They do less dmg than annihilation and don´t lower resistance, therefore it´s better to use annihilation or mercy. That is, I don´t need them in the phys.
They could be relatively useful in heat (or not), but I always have the problem that remove too much HP.
I think are legs that favor energy, because they take them away from phys weapons energy free.
So, for now, new legs are on standby …