The Black Serpents

The Black Serpents are an elite enemy group. Members of Khaenri'ah's royal guard who once served under their captain, Dainsleif, they have been since affected by the curse and have lost their memories and honor. Outside of quests and the Spiral Abyss, they are found in The Chasm: Underground Mines. In combat, the Black Serpents are fairly durable enemies that use slow elemental attacks. When one of their attacks is fully absorbed by a player's Shield, they will grant themselves and/or other nearby Black Serpents a buff at the cost of a percentage of their current HP.

Adventurer_handbook
Once upon a time, these were knights of the realm and carriers of significant status. The long years and a curse seems to have robbed them of their reason and memory. Now, all that remains within that armor is the will to "fight for something, someone, and some matter."Depending on how much wear and tear they have undergone, they are by turns known as "Shadowy Husks" or "Black Serpent Knights."
Description
The Black Serpents are an elite enemy group. Members of Khaenri'ah's royal guard who once served under their captain, Dainsleif, they have been since affected by the curse and have lost their memories and honor. Outside of quests and the Spiral Abyss, they are found in The Chasm: Underground Mines. In combat, the Black Serpents are fairly durable enemies that use slow elemental attacks. When one of their attacks is fully absorbed by a player's Shield, they will grant themselves and/or other nearby Black Serpents a buff at the cost of a percentage of their current HP.