Zen main here, first and most importantly you need the nutcracker skin with golden nuts or honestly its just not worth it, zen’s bread and butter is his ult your top priority should be to charge your ult as fast as you can while throwing out your orbs on targets of importance, with this i mean keeping your healing orbs on the flankers for example, healing the tanks is not your main job you just kinda do it when you can, thats what the main healer is there for. Your discords should be put on targets that you need to kill, so for example the mercy or the zen, normally you comunicate that to your flankers so that they know who to kill first if your whole team focuses the discorded person they die 35% faster and i shit you not, thats pretty fast. Dont underuse the alt fire the majority of good zens use their secondary more than the primary esp to peek corners and whatnot I mean you can make picks with that shit without anyone expecting - Click on their heads press Q when you hear ults that kill your entire team with the exception of tire and highnoon - also dont die with ult up, ult to save yourself if u have to, a dead healer is a useless healer
