@Riot - Randuin's, New Thornmail, and Random Ruby Crystals
Why does Riot keep adding small component pieces to build paths? They are finally getting rid of the awkwardness that is Randuin's currently, with its two ruby crystals that feel so bad to hold. But now they are adding a ruby crystal to thornmail. Banshee's is the same way, with a null magic mantle.
Having all these tiny little components for the build-path feels so bad - trinity force feels good because each component does something. But this all feels over-engineered without considering itemslots and how that ruby crystal is really functions as just a combine increase for the new thornmail. Trinity is a rush item when itemslots are open; Randuin's and thornmail are for much later in the game when you need space for control wards and likely have a few items completed as well as boots.