The Swamp beast would be a unique mob native to the swamp biome/murky water. They would be pretty rare but yet very powerful. Their attack style would be jumping onto a player’s head and inverting their movements. During this time they would also be doing 1-5 damage per second. They won’t stop until they deal a total of 20 damage or are knocked off by another player or arrows/tridents. Then they will resort to using normal melee attacks, doing 3-5 damage per strike. When killed they will drop 0-2 lily pads, 0-2 Sea Grass or kelp, and swamp beast claws/fangs. These fangs/claws could be used to make better arrows, or a sea beast dagger that would do about as much damage as a iron sword, or be crafted into a bear trap type weapon. This trap would be perfect for catching fast common mobs like rabbits, or chickens. And you could attach a hopper for collecting the items mobs drop. They could also be used for mob farms.