Figured out it's more optimal to finish lich bane on Fizz when you get your first needlessly large rod, instead of after deathcap.
AP Fizz Item route: Boots/Null-magic mantle>Catalyst>Sheen>Blasting Wand>Sorcerer's Boots>Rod of Ages>Needlessly large rod>Lich Bane>Deathcap>Morello's>Zhonya's
Starting item depends on how many skill shots enemy mid has. If it's lots then boots, If it's not many then Null-magic mantel. Ofc, get pots with rest of starting gold.
I run magic pen reds, mana regen yellows, flat magic resist glyphs and flat AP quints. Is a complete noob stomping death machine and can carry games easily when fed.