[GAMEPLAY] Event Horizon is invisible when centred on a wall
If the centre of Veigar's E, Event Horizon, is inside unpassable terrain, then the entire ability is completely invisible. This include the warning indicator and the walls themselves.
System specs: Processor: Intel Core i5-4460 CPU @ 3.20GHz Video card: NVIDIA GeForce GT 720 (2GB) OS: Windows 10 home 64 bit 12GB RAM
However, this effect was noticed by everyone in the game, so I don't think the computer specs matter. Reproduction rate appeared to be 100%.