On my first time beating Atheon this week I got an exotic raid primary, but on both my 2nd and 3rd times killing Atheon this week, I have not gotten a single loot drop. No legendary weapon, armor, no exotic, no mythoclast, nothing.
Was this on your PlayStation 4 account? If so, this is because you completed the challenge three times on a single character. [url=http://destinytracker.com/dg/6321474769]Game 1[/url] [url=http://destinytracker.com/dg/6325304698]Game 2[/url] [url=http://destinytracker.com/dg/6325956660]Game 3[/url] The way Raids work in Destiny is that each character gets one loot drop from each encounter for the Raid. Since you completed the 390 Vault of Glass already on your Hunter, the second and third completions did not provide loot. For more information, please see [url=https://www.bungie.net/en/Help/Article/12287]this article.[/url]