Minecraft wiki entry for Nether_survival, associated text: You can ride a saddled strider and control it with warped fungus on a stick to cross a lava ocean. Make sure you know how to get back, though. Lava oceans are sometimes big and easy to lose direction in. If you want, you can drink a combination of Night Vision and Fire Resistance potions while exploring lava seas, because you can swim across lava to the bottom to scan the ground for ancient debris, which can rarely generate under lava seas.