Reality Stone

Before the universe, Malekith The Accursed, leader of the Dark Elves made the a weapon out of the dark and named it the Aether. The Aether is one of the infinity stones. Unique in that resembles a liquid/gassious red substance rather than a stone. The Aether converts matter to dark matter and seeks out host bodies in order to draw strength from their life force.

The first try
Every five-thousand years, a cosmic event causes the Nine Realms to become aligned, and Malekith, the leader of the Dark Elves, planned to use this event and release the Aether, a relic from before the universe, to plunge the Nine Realms back into darkness. The Asgardians intervened and took the Aether from the Dark Elves by force, watching as that race was apparently decimated in the destruction of their warships. Bor then had the Aether hidden away where none could find it, and over the following five millennia its story faded from known history.

The second try
In 2013 near the beginning of the convergence, a portal opened up to where the Aether was located; Jane Foster happened to walk through this portal and through curiosity peered into the Aether, causing it to become active and infest Jane's body using her has a sort of host. After arriving back on Earth, Jane was taken to Asgard by a concerned Thor where the Ather was discovered by Odin. During this time Malekith had sensed the Aether's activity and came after it attacking Asgard. In the end through the sacrafice of Frigga, Malekith and his army left before he could obtain the Aether.

Later though when access to the Bifrost had been restricted, Thor, with a dying Jane, got Loki to get them through



a hidden passegeway to Svartalfheim. After getting there they confront Malekith and through various circumstances he draws the Aether out of Jane and into himself and leaves. After both parties then arrive on Earth Malekith uses the Aether to battle Thor accross worlds during the convergence until eventually Malekith is beaten and the Aether is somehow put into a hand-held container which is later given to the Collector for safe keeping.