Bioluminescent Krill

This mob can only be found in the Midnight Dimension, check my Biomes and Dimensions post, and will spawn in schools. It will be very small but easy to kill, though even cooked, they provide little food,  but they can be used to attract whales, which have their own benefits, but not focusing on that, krill will be really tiny and can be found in a spawning biome, only in the Midnight Dimension, they generate 3 Experience orbs per krill, and a school has 100 krill, so they are amazing experience  farms, they spawn only in the spawning biome, but spawn very often. Also they can be crafted into fish bait with 9 Of them, which increases your chance of catching a fish if you craft it with your fishing rod, however, it will become a normal fishing rod after 5 uses. Also even though they give you as much as raw beetroot when cooked, 3 of them and three glowing ink makes A Bioluminescent Soup, which does as much as rabbit stew, and makes you glow green.