A simple Mod that replicates a bug in Practice Tool.
This bug occurs when two Cloud Drakes are slain before spawning the third drake, and causes the Terrain of the Rift to become transparent.
The Mod only replaces the terrain of the Rift, all other graphics like walls, the water in the river and bushes are the standard Summoner's Rift assets.
(I'm aware that dragon souls make some chunks visible again, will fix soon-ish)