The original Mass Effect released in 2007, two years ahead of Dragon Age. Fans have long theorized that Thedas, the fantasy setting for Dragon Age, could conceivably be a planet in the Mass Effect universe, as there are many Easter Eggs between the two franchises, though there has been no official confirmation from BioWare.
Like the original trilogy, Mass Effect Legendary Edition includes many Easter Eggs and references to popular sci-fi media, and from BioWare's other popular series, Dragon Age.