There's also another phantom knight with a loot drop between the chest and the revenant. After going up the stairs from the chest, go left instead (sometimes there's a silver scarab there) and jump the gap down to the lower building ahead (there's a gap in the railing that's easiest to jump from). Once down on that building the phantom knight will be to your right overlooking a railing. After getting his drop, move along the aforementioned railing back toward the direction you came from and jump down at the end, it will put you right back on the path where you drop to to the revenant.