1. How to prevent unit damage? I want to make a shield ability but I don't know how to prevent unit damage (dying). I looked at Vex's Passive Mana Shield but I still don't understand it.
2. How to make Cone of Sight working that, units are neutral, but if you get into the cone, the unit and few around change to hostile?
The number 1 its a bit hard for my knowledge, but i think i can help you with the second one, if you explain exacly what do you mean with "Cone of Sight".