Rain

The rain is the ultimate danger to Slugcat. The rain will come approximately 15-20 minutes after Slugcat wakes up in the hibernation room. When the rain comes the screen will shake, first obscuring vision, then hampering the Slugcat's movement, and finally killing the Slugcat (in certain underground regions, rains will cause water to rise). Slugcat must find a place for Hibernation before the rain comes, as hibernating will start a new cycle.

Each cycle in Rain World is a different length. Surrounding the Karma symbol in the bottom left of the screen is an indication of the time left in the cycle - the number of full "pips" around the symbol shows the time until the rain arrives. This symbol can be seen at any time by viewing the map, and it will also flash up automatically once half the cycle is gone.