Magma Worm

Field Notes
I've stumbled upon an old relic, notably with two distinct stone prongs. On approaching it it whirred to life, apparently charging up. This seemed to disturb something deep and violent below the ground.

The Magma Worm exploded out of the ground, knocking me off my feet. While I struggled with shell shock, I saw it arc through the sky, then plunge back into the ground with another bang.

Reaching about.. 200 meters, the worm moves extremely fast for its size. Permanently burning out of pores in its skin, the Magma Worm uses this flame as both a hunting tool and a way to melt through the ground quickly. Its small, beady eyes lurch around, looking for prey. With its massive size, the Magma Worm must either eat VAST amounts of food a day or hibernate for a very, very, very long time below ground.

Tactics
The Magma Worm has a single attack in which the worm emerges from the ground, turns around and resubmerges. The worm leaves a small patch of flame whenever it emerges or resubmerges. 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 AoE abilities or abilities that hit more than one target, such as the Mercenary's Eviscerate and Whirlwind, and the Huntress' Laser Glaive and Cluster bomb, 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.