Blade Grave is a location in Tyranny. It is the starting region in Act II for the Disfavored path. In the Scarlet Chorus path, it's one of two choices for the starting region, the other being the Burning Library.
The Blade Grave is the name given to what remains of the Realm of Stalwart, after its ruination when Kyros proclaimed the Edict of Storms upon the lands. The magical storms struck the Disfavored and Unbroken armies during the height of their engagement, now most of what remains is a blighted landscape of discarded armor and weapons, and high winds of rust and human dust.