Whales are very rare passivemobs that are 30m long, and resemble real blue whales. They are blue in colour, and cannot be bred. They can move at 10m/s, and can kill player with their tail slaps. They also spray air out of their blowhole. During the day, they swim with their mouths open at 90 degrees and eyes open. At night, they swim slower, with mouths and eyes closed. They swim in pods. They have undead variants. The first variant looks normal, except they have many wounds, and a swarmed by hagfish and sleeper sharks. The second variant is a skeleton with small amounts of flesh and limpets attached (Not limpet mobs, but built into the whale). The third variant is made of gravel and assorted whale bones, and make the water around them look toxic, and apply the effects of toxic water. They all swim around, and will create a huge explosion that destroys blocks even if they are underwater if they are attacked enough. Whales drop lots of blubber, stage 1 undead whales drop bluber and some rotten flesh, stage 2 undead whales drop bones and some blubber and rotten flesh, and stage 3 undead whales drop gravel and bones
Whalefalls are a biome that is found underwater. They come in different stages. The first stage can spawn from whales that despawn in untouched chunks, and the rest can come from the previous stage. They can all spawn on world generation
In this stage, the whalefall is made of bone blocks and blubber blocks, a new block which resembles flesh. The blubber block drops blubber, a food which can be crafted into flesh blocks, sold to villagers, used as an efficient fuel, or brewed into a resistance potion. The overall shape is roughly that of a whale, with with the major internal organs, and some of the flesh missing. Sleeper sharks and hagfish spawn at this stage. Sleeper sharks are neutral, and if left alone will chew on flesh blocks, and sometime bone blocks. They are about as strong as a naked zombie. They drop blubber. Hagfish are passive, but will produce a 5-6 block wide irregular ball of slime blocks if attacked, and then swim away. They can swim through slime and flesh blocks. They can be caught in buckets, and drop slimeballs.
In this stage, there are less blubber blocks, and a few less bone blocks, and some gravel covering the whalefall. Some of the blubber is moved from the bones, and some of the bones are moved. Limpets and crabs spawn at this stage. Limpets crawl on surfaces, and are small. They can be picked up by hand, like fish can with buckets, and be eaten, giving a useless limpet shell. They drop limpet shells when killed. Crabs run sideways, and are neutral. They are weak attackers. They drop crab meat, which can be cooked and eaten. There are also bristleworms, which are kelp-like blocks that spawn in 1-3 block stacks on gravel and flesh.
In this stage, there are only scattered, half-buried, broken whale bones, surrounded by toxic water. Toxic water is slightly yellower and darker, and gives poison 2, nausea 2, and hunger 2 for 1 minute after leaving the toxic water. You can become immune to toxic water with the sulphophilic status effect, which in obtained by drinking a thick potion. In the whalefall, there are large, almost transparent, yellow-brown clouds that float around. There are also worms. They take damage outside of toxic water. They can live swimming freely in the whalefall, crawling on the bones, crawling on the gravel, or digging through the gravel . Worms vary in length between .5m-1.5m, in width between .1m-.5m, in speed between 1m/s-3m/s, in transparency between 75%-0%, and in colour between any colour in the normal RGB system, with the mouth being another colour, but in the different half of the luminosity spectrum. They can also, sometimes, have patterns, like rings, stripes, spots, and speckles, in any colour.. There are also rare additions to the body. They can have 2, 4, 6, or 8 pastel-coloured fangs, with a varying angle pointing outwards and length. They can have spines of varying angle of elevation, colour and length. They can have back fins of varying colour, height and length. They can have up to 7 pairs of limbs, which are the colour of the body, and vary in length and thickness, and can have fins varying in length, which come out of the back of the limbs, and are the colour of the back fin, if present, and are otherwise a random colour. They can be neutral or hostile. Some can shoot a projectile that causes damage, and looks like a llama spit, but in any colour. Some, rarely can apply a negative effect with their attacks, or a positive effect to themselves. They can drop blubber, bonemeal, slimeballs, or rotten flesh.