Considering it requires two quite rare unique drops from two different bosses, one requiring a very high slayer level of 95, and is untradable, I feel that this neck in it's current state is quite underpowered. It should at least have the same offensive power as an amulet of Glory, perhaps even a bit better, as well as some more defence.
Suggested stats:
+10 attack to all styles (same as current)
+10 defence to all styles (current is +2, glory has +3, fury has +15)
+6 strength (same as a glory)
+12 prayer (same as current)
and maybe..
+2% magic damage
+2 ranged str
What do you think of this? Should the base Dragonbone necklace also be buffed a little?