Evolved Arcmine. It can reproduce. After mating, it lays millions of eggs into the prey's soft flesh. It likes twisted darkness.
Think of this as a evolved Arcmine, thats changed it's element to dark. Beware this thing is immune to special skills, with the expection of Instant Death. They also have high HP and can deal alot of damage. It's best that you go all attack, or use an ability that has Instant Death since the Instant Death can affect them still. They will appear in 2's so be careful