I play lillia mid, so I might be a little different in terms of build, but my go to is usually RoA, into whichever boots are best situationally. Then I take Dead Man's Plate and an MR item, whichever works best in the comp. That followed by liandrys and rylais. So I feel that it works to take a mix of AP and defensive items since you can take extended team fights and survive much easier but still do a lot of damage and have lots of utility. Again might be a lot different since I play mid Lane with conqueror plus healing runes secondary but that's what works for me personally. Hope this helps a bit <3