Skyshards and Sky Prisms are a rare type of meteoric glass. Sometimes called "Shards of Aetherius", skyshards are shards of Aetherial magicka that carry the essence of Nirn. They are sometimes linked to Lorkhan or Anu.
Like other aetherial fragments, Sky Prisms fall to Nirn from Aetherius through the stars, although only during specific lunar alignments. As they fall, the Prisms can be seen splitting into three shards. If three skyshards are subsequently brought together, they reform into a silvery prism and confer the magical energy to any nearby being. As well as allowing mortals to become more powerful through the creation of prisms, absorbing the power of even a single skyshard allows a Soul Shriven to be re-attuned to Anuic magic and thus return to Nirn from Oblivion.
Although usually found outdoors, skyshards are often discovered and brought underground by hoarders. The Ayleids were known to harness skyshards in some way. They can also be summoned through ritual, even in Oblivion. Coldharbour has a significant number of inexplicable fallen skyshards.