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Few things can make a player riding a Rex flee in terror, but an enraged Dimo flock is one of them. What really makes them demonic, however, is the fact they aim for riders rather then mounts. While lacking HP they do have a surprising amount of damage for their tiny size, often come in swarms and are very fast. Their bites give a massive amount of torpor (Think fatigue), with sufficiently leveled Titanoboas able to knock a player out in one bite if you don't have stimulants, meaning you can do nothing but watch as your character falls asleep and gets killed. Their attack damage is nothing impressive and they're easily outrun, but they slide along the ground which can be quite hard to hear and if you don't know what it sounds like you might not react in time.
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Oh, and there is a lot of them in the aforementioned caves. If one sneaks up on you and you aren't equipped to deal with it, you're probably a goner.