Malekith sought to use the Aether’s power to return the universe to one of darkness. But, after eternities of bloodshed, my father Bor finally triumphed; ushering in a peace that lasted thousands of years. I didn't think that Malekith was a titan/an eternal - as such, how can someone like him posses the power to create an Infinity Stone? More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.