"very hard" spell question

[Kikac_NNGK]

hi guys i have an idea for a spell and i cant make it. Can u help me?
I want the spell to place wards (ex. healing ward), and in area of 300 each entering ally unit to be made invisible and enemy invisible units to be visible


Can u help me about that?

Thanks in advance

 

[AdamGriffith]

Well you could just base it of a normal ward spell and null the damage and abilitys etc. Then add True Sight or whatever to see enemy invisible units. Then do a periodic check to make ally units invisible.