Cremator

Description
Only spawns in the Magma Barracks.

Shoots a random shotgun-blast-like-spread of bombs with the white circle, much like the Wandering Vagrant's attacks to show where they'll hit.

This attack is easily dodged, but can hit you on the way up to its target zone and can be used from anywhere on the level.

He spawns in one of three places: The lava at the bottom left, bottom right, or upper left; swimming like a giant turtle.

The lava tunnel where the Miner's pod is located may spawn in the lava pit where the Cremator spawns.

On Monsoon difficulty, the targeting reticules will not appear, making the fight more difficult.

Tactics
When fighting the Cremator the trick to dodging his damage is to keep moving. Try to dodge in the opposite direction of the boss, as passing through the stones he flings will result in you taking the damage. If you must dodge towards him, keep an eye on the arc of the stones so you can pass under them. When attempting to damage and kill him, use the platforms to attack him (try not to fall into the lava).

Also, try to avoid being on top of him when he attacks, as it's possible for him to spawn all of his projectiles on top of you, which will deal a massive amount of damage.

Cremator