Whiplash

The whiplash is a new monster featured in Doom Eternal. It is a vaguely humanoid demon which has been reduced to its head, arms, and upper torso and attached to a cybernetic serpentine tail. It has multiple means of attack: it has a sharp appendage on the end of its tail and two claw-like blades which are attached to to its arms on extendable chains. The demon has red glowing eyes, two backward-curving goat-like horns, and has an exposed brain.

According to an interview with art director Hugo Martin, whiplash demons are female.

Tactical analysis
Whiplashes are very dangerous due to their high speed and long range whip attacks. Ice bombs can be used to great effect, preventing them from slithering around.

Lore
The Whiplashes were initially discovered by the UAC in the Sanctum Wastelands, and became subjects of interest on account of their agility and the bladed whips concealed within their forearms. Despite the danger of acquiring living specimens, UAC researchers successfully managed to craft cybernetic augmentations to further boost their lethality.