As far as I can tell, all planets currently have a molten core. There have been a number of suggestions regarding 'living planet' types, and the tentacle biome already is a path in that direction. I'd like to see those living planets have like... an acid core or something, potentially with shafts that lead to it all the way from the surface. Secondly, it would be pretty cool to have some AI life planets too, populated by robotic 'animals' and containing a glowing blue plasma core.
I really hope there will be something like this not lava in the middle. Each planet should have its own core
Completely agree with this, I came across a planet with a fleshy core, but when I dug down enough it was just a giant ball of lava again.
