Magma Worm

Behavior:
The Magma Worm has a single attack in which the worm emerges from the ground, turns around and submerges. The worm leaves a small patch of flame whenever it emerges or submerges, this indicates where it will emerge from. When fighting the worm, it is difficult to fight with other enemies around, as you may be forced to dodge into them. Climbing onto a rope or vine can prevent all damage this worm deals, as it only deals damage through contact when it goes up or down. This is an advantage for engineer's Thermal harpoons. This boss can be very easy to kill with area of effect abilities or abilities that hit more than one target, such as the Mercenary's and, and the Huntress'  and , because the worm has multiple segments that can be damaged. When on low health, the worm will strike faster and move faster, but will become less accurate.

On death, the worm may drop the Burning Witness item.

Elite Version
This is the only elite version of the Magma Worm, and this elite boss can be one of the most annoying enemies one will ever encounter. One difference of this from the normal one is that the Magma Worm's skin is enchanted with electrical aura (much like there is a Tesla Coil on each segment of the worm. It is also observed that the Overloading Magma Worm's aim is much more accurate than its normal version. The Overloading Magma Worm also has a significant HP increase.
 * Overloading Magma Worm

Magma Worm