Careful of their swarm in Lava caves they will gank you and quickly surround you and push u just little on every hit ... Make sure you have wall behind you and stand with your back against it while fighting them ... Or else Lava ...
On Raganorok I had just tamed a pteradon at the Viking bay, I flew over the mountain with my pteradon to the castle I landed on the top of it and all of a sudden I get swarmed by onycs and since my pteradon had no stam we got swarmed and my pteradon “Perry” was killed and I tried to avenge him with my crossbow but was killed! RIP Perry
It says these are 'non - violent' but my god! They are not! I found 6 of them inside a cave. These started attacking me on sight, I'm a beginner so I fled the cave and outside was my ptera on attack target mode and they began to fight and they took my ptera so high in the sky that it couldn't hear my whistles and finally they killed my lvl 60 ptera while I stood down helplessly and watched ptera getting killed.
Bats now deserve some new levels of respect. Like their fellow Cave dweller the Megalania, they have a chance to infect you with Mega Rabies (though only a chance rather the 100% like Megalania)
They are easy to spot and avoid using bug repellent. But due to the new Biological weapon element of them. Engage at a distance where possible. Fight them with sword and pike only as a last resort. Make sure you have a stock of Antidotes or Wyvern Milk before any Splunking