Magic Wand should be core or at least situational. Vlads and BKB should be swapped, or both be in situational. Moonshard should probably be in extension, as it is very common for AM to have enough farm to get 7-slotted.
PMS should be core or situational, this item is fantastic on Ember for a variety of reasons. Early game or situational should have BoTs and Treads, not BoTs as luxury. BoTs first is very good and treads are also very good right now, to the extent of being more useful than Phase in most situations. Skadi and Blink should be in situational probably, maybe not blink as it's a bit more of a higher-level item in terms of its use.
Aquila and Drums should probably be swapped in my opinion, Aquila is better than Drums in the majority of situations in the current patch.
I would swap SnY with Manta; you only particularly want Manta if there is a silence to combat or you have some need of split-push. Almost no one is getting MoM anymore, and everyone is maxing spin first, usually with some stats thrown in and value points for heal and crit. It is probably worth putting Blink Dagger into situational items. Probably swap MoM with Drums (remove MoM, put in Drums). Drums is a really good item in the current meta.
BoTs should be core or at the very least situational. I don't think you ever get diffusal, manta, AND drums; I would move Manta into situational, or else drums.
Should have Wand as core/early game. In fact, almost every hero ever should have wand or stick core.
Phase boots early game for getting all dem last hits and increasing mobility. Octarine should be in extension items.