Refine Rune Pack/Charm Materials Pack

Your goal is not just to be the top of your server, but rather top 1 in every sage world battlefield.
Power won't help you if the enemy's got higher initiative that you, allowing them to move first and disable your ninjas before you can even move.
A person with 1-2k less power than you can easily kill you if he has higher initiative on his 1st move ninja.