Molten Spring - New Nether Biome

Molten Spring can rarely generate. Simply put, the sulfur cave of the nether. It is a cave with layered verticality and many active lava geysers. Striders also spawn here.

Its lava pools can sometimes contain potent magma block under it. Any lava pool that contains magma potent not only produces bubble boiling particles but also can make any players that swim in it take mining fatigue if stayed too long despite having fire resistance or not. Potent magma can also be crafted using 8 magma block and a molten rock. 

Molten rock is the ice equivalent for lava. It will melt into lava if mined normally, but can be picked up with silk touch. Molten rock can be found generated naturally along the lava pool in the molten spring, but can also be renewed by placing cobblestone on the lava pool that's powered with potent magma inside it. This doesn't make the lava renewable because when molten rock forms, it displaces the lava source block in the process

Lava geysers can be found at the surface of lava pools at molten spring. Lava geysers can be activated when a lava-submerged potent magma has a blue ice under it. Similar to how water-submerged potent sulfur can generate geysers when magma block under it, the sprouting geysers plays at an interval that's determined by potent-to-liquid surface distance. Additionally, if powder snow is placed under potent magma instead of blue ice, the geyser will be actived continuously. Striders uses lava geysers to travel vertically between the pools.