Just by Awakening, Sybilla gains range 200 x1.5 powered magic slash on skill (that can instakill). Skill Awakening trades the instakill portion (and 5 seconds more in skill cooldown) for 280 range and x1.7 multiplier.

Dunno, I think she's good as she is, with less need to prioritize SAW. Better spend the resources on clear upgrades first.