Diamond Titan

The Diamond Titan is an intelligent Titan that (unlike all other Titans encountered) resembles a female in terms of build. It also possesses the ability to cover portions of its body with a semi-transparent crystalline substance. This substance proved impervious to attack, and was initially assumed to serve a purpose similar to that of the Armoured Titan's bone plates. The Diamond Titan could also form blades using the crystal substance, which protruded from its forearms just above the wrists and down over the top of its hands. The diamond substance would only appear for limited periods at a time, and could only cover a limited area.

The Diamond Titan was part of the Titan 'counterattack' which defeated the Imperial Army in the 2nd Battle of Upper Franconia. It launched multiple surprise attacks, managing to approach formations undetected-despite its large size-until it came within close range. It caused extensive disorganization within Prussian lines, and would continue to attack supply lines long after the Battle was over.

It was last sighted in 1855 during the retreat back to the Walls. It apparently did not attack the retreating formation it encountered, but instead watched from a distance.