Nyx doesnt rly have any specific counters so u can insta pick and give ur teammates extra time to think. With this build go mid and nowhere else. U will notice that there are plan A and plan B core items. Plan A items are if the enemy has a lot of str or int heores witch means that they will have a low armor basicly allowing u a 1 hit kill with a deso and vendetta. Plan B however are just ur regular old school dagon e-blade nyx in case they have like...5 agility heroes in that case deso will be useless.