The T'lan Imass are an ancient race of undead warriors from the Malazan Book of the Fallen series by Steven Erikson. They were once living beings who chose to undergo a transformation to serve their purpose in an eternal war against the Tiste Andii and other foes. This transformation grants them immortality but at the cost of their humanity and emotions. These warriors are bound to the will of their leaders, known as the T'lan Imass High Mage, and are often seen as relentless and unyielding. They possess unique abilities, including the power to manipulate the earth and summon the dead, making them formidable opponents in battle.