Biological Horror (referred to internally as Fiends) is a creature, more specifically classified as a Burrowing Monstrosity.
Several of their nests surround an Abandoned Building and each one contains multiple Whispering Eggs.
Their Whispering Eggs can also be found around dead worlds, lying around the surface without nests. They are the only creatures that can be encountered on dead worlds.
Destroying a Whispering Egg will drop a valuable Larval Core which if not picked up, will disappear in a few seconds.
At the same time, multiple Biological Horrors spawn, and if killed they will respawn until the player reaches a safe place, like entering a building. After a set amount of time they will retreat.
Their melee attack is a ram, and does incredible damage. If the horror rams the player and the player doesn’t move enough, the horror will repeatedly ram, as if it were thrashing. This makes horrors able to kill unsuspecting players extremely quickly.
There is a chance that the ram deals incredible knockback (launch of the player), instead of incredible damage. If this happens, the player will be catapulted in which ever way they were rammed. If the player is launched at the building, there is a chance they can get stuck in the wall and not be able to move, forcing them to log out. If the horror rams the player another way, they will fly through the air until they reach terrain. Be careful when encountering horrors on mountains or hills, as the knockback can throw a player from a mountain and send them hundreds, or if on a huge mountain, even thousands of units away.
Hazardous Flora is a type of flora that reacts to the presence of the player. They don't show up on planetary scans but they can be revealed with Analysis Visor.
Their poison is extremely toxic and can incapacitate a traveller quickly without proper protection. Destroying them will not alert sentinels.
Tentacle Plant is known for its whipping, poisonous attack. It is classified as flora, can be scanned, and will show up in the discoveries with a randomised name.
They are scattered abundantly on planet surfaces where flora is present and have an attack range of about two meters. Damage will occur to the player whether they are on foot or inside an Exocraft vehicle. They provide Oxygen when destroyed with the Multi-tool, but remain unharmed if driven over.
Some may even take root in the ceilings of Abandoned Buildings.
Underground Toxic Hazard is known for its pulsating, poisonous attack. It is not classified as flora, therefore it cannot be scanned.
They can be found in caves and 8-14 units of Oxygen or Sodium can be harvested from them. It requires Haz-Mat Gauntlet and can be done from a safe distance, without taking any damage.
Destroying them with the Multi-tool yield the same amount of resources.
It is advised to use the Torch as they can blend in the environment, their texture only changes when the player looks directly at them. A red glow makes it more apparent.
Carnivorous Trap Plant is classified as flora, can be scanned, and will show up in the discoveries with a randomised name.
It can be harvested for Oxygen with Multi-tool as all hazardous flora can. Getting too close to it, the plant's open mouth will snap shut and injures the player.
Bloated Gas Flora are classified as flora, can be scanned, and will show up in the discoveries with a randomised name.
Getting too close to it will result in the flora's upper part starting to bloat, ending in an explosive burst of gas. This can injure the player if they remain in the flora's vicinity.
Three Gassy Pods can be found on the outside of these plants. These pods can be harvested to yield more Oxygen than just normally destroying it.
These pods can be identified by the red sacs on the outside of the plant. They are more visible at night as they glow.
This method is dangerous as you have to get close enough to the plant to harvest the pods.