HELP root zenfone2 and instal android 6.0

dear digitians

can anyone guide me how to root my Asus zenfone 2 and install marshallow on it

i have visited xda dev forums and found cm13 software
[ROM] [6.0.x] Official CyanogenMod 13.0 Nigh… | Asus ZenFone 2

i wish to know Cons of cm13.0 marshallow.

i wanted to do it b4..but i was woried about warranty. now its only 2 months left for my phones warranty. i wish to void it.

tnx