Molten Cavern

Basically it is this cavern you can find in the overworld while exploring. The lava cavern forms in deepslate and holds magma blocks, magma, and a new lava creeper mob. The lava creeper mob is just a creeper that has more health and deals some more damage in its explosion. Magma is also a new liquid. It looks darker than lava and when put into a bucket, it cools down into regular lava. The magma deals slightly more damage that regular lava. Also in the molten caverns, you can find molten stalagmites, which look like the regular dripstone stalagmites but have lava flowing in them.