I gave NYX Aghanim's Blessing. Priority skills : Burrow = 2, Vendetta = 1. And attack-free medal.

Result = Nyx not used 1,2,3 skills :) // Spiked Carapace, Mind Flare, Impale
He was just sitting in invisibility :)

I thought that i'm just increased the priority of some skills. And those that are at 0.They will simply be less of a priority but not disabled.