Board Thread:Questions and Answers/@comment-28439145-20171202021851

Here's what I think:

Crystal Slimes. They damage you when you touch them and they also create huge spikes that do a crazy amount of damage. All the other harmful slimes just damage you if you come into contact, but don't do extra little things. Mosaics are the least harmful, because they (usually) only make fire when they're hungry and you can easily avoid the fire anyway. Rads are the second least harmful because you have to be standing in their bubble for a long time before you even START taking damage. Booms are the third most harmful because they can be calmed down with water and they warn you before they explode, and Rocks are the second most harmful because they can't be calmed down and they can come at you in fast little balls of death (by the way, Crystals do this too, but only when they jump). 