Wraiths

Wraiths (魔獣) are manifestations of grief in the new world recreated by Madoka Kaname. They replace the witches that magical girls must fight. They resemble tall statue-like men wearing robes with no visible limbs (though concept art shows them as having hands that shoot thin lasers to attack). Their faces are partially covered by digital polygon-like shapes that appear to glitch out randomly on or around their being (1).

In this Universe, Wraiths are created without being created by Madoka (She does not exist).

Normal Wraith
They assault magicals with laser beams. You will always see them together.

Shugen Wraith
Stronger than Normal Wraiths. Possesses flaring heat. Bronze sabers come out from its palm, and it wields a flaming spear.

Satori Wraith
Stronger than Shugen Wraiths. Squashes foes with its blocky viscera.

Moksha Wraith
More durable than the three other Wraiths. Uses ice powers.

Reference
(1) https://wiki.puella-magi.net/Wraith

Trivia

 * Wraith types are named after Buddhist levels of enlightenment.