Liches are a type of enemy in Homestuck, first seen in the Land of Light and Rain. They appear to be a mid-level enemy. They have bipedal bodies and skeletal heads with large horns. They also wear tattered harlequin outfits and may possess bird heads, wings or tentacles due to prototyping.
In modern fantasy, Liches are typically wizards who have used their powers to gain life after death, which may be the reason for the skeletal heads. Whether these Liches have any powers or not has yet to be seen, as they were quickly dispatched as soon as they were discovered.
Equius Zahhak and Nepeta Leijon were seen fighting a number of unknown pink and purple Liches on LOLCAT, during the flash . These liches may be associated with already revealed pink and purple grist such as Amethyst or Marble, but this has not been confirmed, as no grists were mentioned by name during the entirety of the trolls' session.