This is a build that is made for exort comboing.
The list of combos:
Main midgame combo is Eul -> Sunstrike -> Meteor -> Def. Blast
Eul + EMP
Eul + Ice Wall + Cold Snap

Instagib combo:
Eul + Ice Wall + Cold Snap + Forge Spirits + Alacrity on yourself (or one of the spirits for more armor penalty).

Starting itembuild is made for getting a fast bottle, as it is crucial to have enough mana.