Go down the whole through the lava fields to lower lava fields and get past lava monsters

yo mama

Go to the second level. Go to the very last island. its there

The lave fields are at the end of Blackdelve Reach, just follow your map. You will need
the Exchanger, find it on the second floor of the fields. Go back to the first floor after
obtaining it, and find the lava rider. Get in it, and follow your map again. Forget about
any enemies you see on your way through, its tough to fight them on those small limited
islands. The Lava Pump is on an island covered in pumps and metal. Once fixed, Gate out
and save if you want to kill the Rock Monsters and Beetles. Gate back, and drive onto the
closest island, and use your bow (best approach) and sword to kill them.

get the lava car thing adn go far north east