only needed 2 items (testing out new mythics). I can confirm that Radiant is best for my Illaoi, but I will explore all new mythics! Currently finished with this and Jak'Sho. :
SUPER TANK ILLAOI! New best build for Illaoi in Patch 12.10 - YouTube
Illaoi Build, Runes, Counters (Top, Season 12.23) - OP.GG - League of Legends
Illaoi Top S12 : build, runes et stuff - Guide LoL - Millenium