You could have NPC's in set locations around the map that work like Watchers in Dota. You have to activate them with a heavy melee and afterwards, if they see an enemy hero in their area, they give an audio cue and brief vision on the map. To be honest, 90% of why I'd like to see this is so we...
I've had this happen in another game as well. I'm not sure what causes it, but at some point I'm unable to use or even select the cube. Could just be a skill issue. I have I have default self-cast. Tried switching ability from a mouse button to E and it still didn't work.
Match ID: 39668868