You should do this build for jg Ekko because with the build fully completed you can do stupid amounts of damage. RCS Allows your q to slow even more and allows you e to slow as an added effect and the extra armor seems pretty nice. Morellonomicon works because the CDR and the AP and Grievous Wounds is nice for the champs that run Warlord's Bloodlust. Nashors Tooth allows you to up your AP and Attack Speed for Ekkos passive. Lich bane has the same passive as Rune Glaive except its a little bit better sense you get the mini movement speed and SpellBlade is really good since your hitting an auto with your E so you take a really big chunk of their HP with just these items. I can also see people replacing Nomicon for Ludens Echo since it works ether way.