Reeri Yakseya (Sinhala: රීරි යක්ෂයා) or Riri Yaka is a demon in Sinhalese folklore, believed to be one of the most cruel and powerful, second only to Mahasona (Ritigala Jayasena or Ritigala Jayasinha).
[2] It is believed he can afflict all kinds of illnesses on humans, but hemorrhages and blood diseases are especially attributed to him.
He stands by the dying person holding a Rooster in one hand and a club in the other, and the corpse of a man in his mouth.
When Reeri Yakseya assumes this form, he is known as "Maru Avatar".
[2] Reeri Yakseya is believed to have more than a hundred incarnations as different people, including the son of a king named Sanka Pala, a son of the king of Lagal Pura, and a female demon called Ginimuru Yaksani in Hanumanta Desay.