Dark Elves

Dark Elves are an ancient race of corrupted beings from the obscure world of Svartalfheim. They are ruled by Malekith the Accursed, and the most powerful amongst their ranks was Algrim the Strong, who was transformed into Kurse. They're among the major enemies to the Asgardians, next to only Frost Giants, otherwise called Jotun. They possess gifted intellects, as well as superhuman strength, speed, stamina, durability, agility, and reflexes. Some Dark Elves, like Malekith, can use magic to shapeshift, teleport, Dark Elf Cannoneer project energy blasts, and so on. They have a weakness to Iron.

Etymology
, Old Norse for black elves, are beings who dwell in Svartálfaheimr (homeland of black-elves). They lived in the murky underground as they could not be exposed to the sun. If touched by the beams of light, they would instantly turn into stones.