One of the best tames in the game. Tame one immediately. They are an incredible underwater tank, and are decently fast. They turn on the spot in water, and can crawl and live on land. They are immune to jellyfish and eels, and they can harvest biotoxin better than anything. After killing a jellyfish they gain and attack buff that makes it incredibly strong. Its saddle is an infinite oxygen tank, meaning you can never run out of air with it. Its saddle also holds four people so you only need one to do underwater stuff with your tribe. The algae it produces is a herbivore equivalent for mutton, meaning you have something better than crops to take herbivores with if you aren’t at kibble tier. Its algae can also be used in a recipe to make algae sushi, the only thing in the vanilla game that can restore lost taming effectiveness. It’s a passive tame with Biotoxin and can be tamed very early on and very easily. However it only eats biotoxin, including babies, and babies have to be grown underwater or else they will suffocate on land while babies. Tame as soon as you can, these things are one of the best in the game, by far the best aquatic tame.

An underwater tank who is immune to jellyfish stings AND acts as a giant scuba tank for its riders. Oh, and it passively produces the equivalent to mutton for herbivores. Facing something you'd rather avoid in the water? Just take your turtle onto the land; that's right, despite not having an O2 stat, this mount can also travel on land. For how easy it is to tame, this thing offers incredible value to any tribe that has one.

The archelon can also eat berries when tamed it really helps for stopping it from eating all your biotoxin

Babies has to grow in water until they reach adult, if you won't raise them in water in land they will die after few minites

Level it's food stat to increase the max amount of Algee it can grow before stopping.

Very useful to tame tusoteuthis, since achelon are immune to torpor and have a large amount of health to soak damage.

When breeding Archelon, make sure the babies are fully submerged in water or they will die. In addition, they can be fed with cheaply produced kibble (such as Basic Kibble) if you are running low on biotoxin

When tamed, these guys are amazing at getting biotoxin as they can’t be stunned much like basilosaurus. They also are super useful as the algae that generates in their inventory (more effectively while in water) can be used as taming food for herbivores at similar effictiveness as mutton. Archelon is also good at gaming tusos or ceratosaurus due to their super high health and abundance of higher quality saddles in drops

Best bio toxin gatherer and really good against some harder creatures