Rain Slime

The Rain Slime is a mob in SkyBlock. Rain Slimes spawn naturally in the Spider's Den when it is raining, in the area where skeletons spawn, at the base of the mountain. Rain Slimes give the player only +4 XP, regardless of size.

Strategy
Since slimes do not multiply upon death, players will not have to worry about that when dealing with them. Some of the larger slimes have a lot larger reach than they seem to, so if the player does not have much and can get one-shot by them, the player should probably fight them from afar with a bow.