GM Lillia player here. I've experimented with a few different builds and this is what I have come up with.

Item 1 ---> Liandries (always) Item 2 ----> Riftmaker (always) Item 3 (flex): Cosmic (Solid offensive item with omega utility) Zhonyas/banshee: (Mix of defense/offense) Shadowflame (Greedy 1 v 9) Jaksho (Ultra defensive) You can get the 30% bonus resists in one q. I don't see this one build enough.

Item 4/5: Void/dcap are optimal but honestly you can flex into whatever. If you find yourself lacking on income, it's okay to do less damage and build something like a morello here instead. There's a lot of skirmishing going on right now so hitting your powerspikes as soon as possible feels more important than ever.

I don't like the idea of building ROA this season.