idea for cave biome: the pastel caves

the pastel caves are a beautiful cave biome but not everthing here is so joyful.  there is a new item,  three new mobs, just for this cave, the first is the shimmer, a cute little animal that when your not looking at will slowly creep up behind you and snatch whatever item you are holding, the second is the snoreling, this entity will sit there asleep but if it gets to loud it wakes up and becomes very fast strong and tanky it will wake up over time if it does wake up without it being loud you can tame it with a apple, and last but not least the shadow, they slowly accumulate over time slowly creeping towards you once they fully accumulate it takes them forty seconds to accumulate they are immortal once fully accumulated the to get rid is with the pastel torch this will not work when they are fully accumulated a ordinary torch will work and make accumulate ten seconds faster. and finally the pastel torch a torch that shines a dark green light in a ten block radius they are crafted with a torch and pastel shard which is obtained by the new the cave is made out of.