I went Necrolord on my rogue and my buddy went Kyrian. Serrated Bone Spike out performs his ability in damage on bosses and I'm positive the 7-13% agi buff I get when I cast it and 2% buff for nearby players (3 melee + tank) are benefiting more from than that than what he gets from Kyrian.
Kyrian is the play for PvP and trash mobs that die quick but honestly the SBS its a pretty good ability for bosses. Agi % buffs + ranged low energy combo point generator is very useful.