PC on Obsidian Edge?

I got one in my FoW run earlier, and I've never heard of it, so I have NO idea what it's worth, lol.

Ebon Obsidian Edge of Fortitude
Req - 11
(earth) Dmg 15-22
Health +30
Inscription;
15^50

How much would it be with a perf. sundering mod?

Thanks for the help :3
~Ash

anybody? any help at all would be appreciated :3

not 100. sure but I thought r11 was around +55 or so? (might be less)