God rays effect
Cast rays of light from the top of the screen. This won't work well if shown on top of the background color of the scene. Be sure to use an object acting as a background or a floor.

Angle tilts the direction of the rays, and Center X/Center Y move the point they emanate from. Gain and Light control the brightness and spread of the rays, while Lacunarity changes how detailed and broken up they look.
The rays are animated over time: use Animation speed to set how fast they shift (0 freezes them, 1 is normal speed). Enable Parallel for straight, parallel rays (like distant sunlight) or disable it to make them fan out from the center point.
Reference
All effects are listed in the effects reference page.