It is almost impossible to get to the end without the use of exploits. If the lava is touched even with full health, it will still 1 hit kill.
The Lava Cavern has the same design as the rest of the Volcano, except for a large number of red particles it releases and the rock wall enclosing it. As the Volcano is difficult as it is, this cavern holds more danger compared to the obstacle. It mostly consists of deadly lava and is still a health-depleting zone.
The Lava Cavern can be accessed by going into the Volcano, going down the irregular path near the mid-point of the Volcano, and going into the dark tunnel leading to the cavern.