The Harlequins are followers of the strange Eldar god Cegorach, the Great Harlequin (also known as "The Laughing God"), one of the only two Eldar gods to survive the Fall.

Harlequins are warrior troubadours whose carefully constructed masques and impressive displays of mime and acrobatics tell the many strange stories of Eldar mythology. They wear exotic multi-coloured costumes, brightly patterned to represent figures from the Eldar myth cycles. The groups will wander through the Webway, visiting Craftworlds and other Eldar strongholds in order to re-enact stories from the ancient mythic cycles through song and dance. These strange performances are highly symbolic and are considered an important event for the Eldar. The Harlequins will also appear in times of need and fight alongside other Eldar, aiding them in the interest of some secret goal.