Tried to force success with marketing blitz
There was a Krull board game, Krull card game, Krull arcade game, and a Krull Atari 2600 game. All released to coincide with the Film's theatrical release. I wouldn't be surprised to find out there was Krull Underoos set also. Or Krull bed sheets and blanket.
The movie itself is not very good. It's not the worst fantasy you've ever seen, but it doesn't excel in anything. I find there is entirely too many marketed products for the movie to match its popularity. I think this was the plan of marketing, to fake the movie's success with a rush of products, and trick people into watching it based on this fakeness.
The whole premise is a contrived marketing gimmick from the get go. Swords and Sorcery vs. Science Fiction (laser weopons, time travel, space distortion). It was trying a bit too hard not to ape Conan.