Nebulous
Legend
Maybe have the frost giants catch up with the group and Artus (along with Dragonbait if you don't want him around) flee so that he does not endanger the group. He knows that as long as he has the ring they can find him and hunt him down.
Then have him pop in occasionally as an ally to help the group - even if it's just a set piece where the group is facing overwhelmingly deadly foes that under normal circumstances would be a TPK. Have them fight part of the group while Artus fights others. As long as you don't overdo it, this can be fun. Artus doesn't stay long of course, he has to keep on the move ahead of the frost giants.
And THAT Oofta, is probably what I was thinking of doing. The giants are after the Ring, they wanna smash Artus, and the longer the PCs are around, they're going to get squished too. But then I can have Artus pop in here and there for some surprise deus ex machina!