So I added four new mobs to the new 1.17 deepslate caves. Base Ideas by Wattles.
Type /function deepslate:give_spawn_eggs to get all spawn eggs for new mobs.
Discord: https://discord.gg/JcFpyCC
Wattles Video: https://youtu.be/4d5t4TvQkgw
Deepslate Cave Spiders replace spiders under y=0. Their are just caves spider with one different, their loot. They can drop a Glow Spider eye, that can be crafted with one stick like a torch to make a soul torch, or 1 vine to make 2 glow lichen.
Deepslate Creepers replace creepers under y=0. Their have more health than a normal creeper, and deal more damage. Deepslate Creepers are slower than normal creepers.
Mingers replace witch spawns under y=0. They are a dwarf illager, and attack you with an iron pickaxe. Mingers deal 7 damage, so watch out. When killed they drop an emerald, and a chance for their pickaxe.
Amethyst Bats replace bats under y=0. Amethysts bats drop 0-2 amethysts shards on death. They are hostile, inflicting blind and poison for 5 seconds whenever attacking. Amethyst Bats can burrow into blocks to hide from attacks, and will guard the cave they spawn in.