The Reaper

The Reaper is a deathly psychopomp in the lore of Dota 2.

Appearance
Little is known about the deathly Reaper besides its appearance and its abode. In Dota 2, this foul Reaper is depicted as a figure whose disembodied form is cloaked by a sable shroud. This psychopomp always carries a massive scythe, most certainly used to harvest the souls of those who have departed from life. In Artifact, the Reaper is still depicted in the Book of the Dead as a dark hooded figure wielding a large scythe, but it appears the Reaper also has a pair of red eyes and a pair of wings that resemble that of an angel's feathered fins.

Domain
Like a hungry predator, the Reaper in Dota 2 is said to lurk beyond the veil of death for souls to harvest with its scythe, suggesting that it dwells in the Underscape.

But in Artifact, this Reaper is depicted in a skyscape similar to common interpretations of Heaven with the clouds and the sun's rays shining through them. This seems to elicit the idea that the Reaper must be an angel of some sorts.

Allies
The amount of death has caused with his power has garnered him a following from the Reaper. Thus he can summon the psychopomp itself to cull the living.

Enemies
Nobody in Dota 2's lore likes. Even he knows that Death itself reviles him.

Others
Within the Red Mist was its Reaper, who in truth was, a devil of a man who slew cowards and deserters. Perhaps the Red Mist Reaper was inspired by the psychopomp itself.

In 's biography, it is said that those who don't fear the Reaper do have Pudge to be afraid of, which Pudge himself asserts.

Trivia

 * The Reaper's angelic appearance in Artifact might be a reference to some depictions of Azrael, the angel of death in Abrahamic religions such as Christianity and Islam.