Frozen Mallet on Illa
Why isn't that a thing? Imo it would be an AMAZING mechanic, if her AA's on the tested Spirit slow indirectly the enemy (who most time walk out of E's range)
Also cool: if this would be a playstyle, she could take the comet-rune like most
s do (<-- this Sion thingy got me the idea btw )

is your core build. Your last 2 items are generally more armor or mr. Your kit is also much better to fight multiple opponents as opposed to just one. Building a Mallet will just make it that much less favorable for you to fight multiple opponents. Sure you get more HP and damage, but you're losing out on resistances meaning you'll be less useful in team fights.