The Black Hole is a large, yet nearly invisible "super - tank" or boss tank as an replacement for the arena closer. It appears rarely in tag, domination, or mothership and is one of the only tanks that can kill and survive against an arena closer. It moves slower than a basic tank, but faster than an octotank.
The Black Hole consists of a large black area, and a faint silhouette of the actual tank. Any tanks nearby will be pulled toward it, getting stretched and spaghettified. If a tank gets close enough to it to be touching the actual tank, they will INSTANTLY die, no matter how much heath they had.