InEffect: Think you've already got everything with imperial. Pretty sure it includes panda and season pass, no?
And then you've got maps, module, music and all that out of game stuff. Long story short, you don't need to buy that one, I believe.
AlucardNoir: Everything but the FLAC soundtrack that I thankfully never wanted and the two free DLC that I had to add separately to my account - why they were not included is beyond me though, they're free after all. I just hate the way GOG does DLC, DLC bundles and game editions... also how they do search and tags but I'm digressing.
Anyway, the game devs might want to rewrite the description page for the Royal Ascension DLC to make clear what it does.
Man yes. Search and tags. I wish I could mount a crusade on that one. Tag's are near worthless. You tag your stuff. (space, rpg, shooter, adult, kid, horror, etc.) Then try to search for an rpg space game and you find out how worthless your tags were. Space and RPG gives dnd style rpgs, space rpgs, space shooters, space text games, horror space games, etc. The tags doesn't help you except in the littlest bit.