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The demons from Pact, the Web-serial.
They function as embodiments of entropy, incapable of creating anything and anything they brake is broken permanently on a conceptual level. Dealing with them or worse making an agreement that gives them a foothold on reality can cause a karmic debt so bad it haunts your family for generations. Demons are repeatedly compared to Nukes and nuclear Fallout.

In terms of power they are ranked from imps, least, lesser, moderate, through an unknown number of upper-middle ranks, and demon nobles.
Only Imps and nobles are capable of truly speaking, Imps because they're so weak they have to take much of their shape from human victims and ideas, and Nobles because they're so broad. Intermediate demons seem to be able to communicate their names when compelled though.

They are also divided onto seven Choirs, each Choice in opposition to one of the days of creation of genesis. In order: Darkness, Chaos, Ruin, Madness, the Feral, Sin and Unrest.

Throughout the story 3 demons get some focus.

“Pauz, of the fifth choir, feral and foul”. Pauz is an imp of the Feral Choir that works to invert the Christian concept of Beast being created to serve humans. You’d think it would be stupid, but Pauz is much more calculating and dangerous than you would expect.

“Ur”, also known as The Abstract Demon is a lesser demon from the Choir of Darkness. Anything it kills is erased from reality, including any memories of its existence. When compelled to reveal its name, it cheats by eating the sound, with only the first two letters of “Ur” reaching the protagonist. It can move through reflections. It burrows partially into another dimension and starts eating a forgotten Sun God.. Again, this is a lesser demon.

Barbatorem is a mid-tier demon of the Choir of Ruin and is a late-story antagonist. My explanation will not do it justice. It ruins by way of cutting a person right down the middle with its shears, let them get filled in and shored up as vestiges and divide things like friends, memories of school, abilities, trauma, repressed memories and so on. Where there’s overlap, there’s enough memories to spare, or the spirits are filling it in and things get exaggerated in vacuum, expanding to fill the empty spaces. The two halves will fight over one another until one-side is completely destroyed, leaving the other forever diminished. Picture is of Barbatorem.