try to get tear of the goddess and sorcerer's shoes then go straight to rabbadon's and void staff for maximum damage of your ultimate skill. After that complete the Archangel staff then zhonya's and last will of the ancients.

I only leveled 2 lay waste because i only need it for farming(last hit) Try to farm as quickly as possible

during clashes. Use your wall to set up or support the clash. Always enter last. You can flash then use defile or just go in and use flash to escape.

My build is specially design to destroy clashes with one skill and that's requiem at the same time support your team with powerful magic aoe damage. I added clarity so that I don't have to be mana dependent.