So it seems that the death curse and premature betrayal adventures are locked so that you need to have completed 5 adventures or 'variants' to unlock them.

But there is only 4 adventures available before them. The ring of regeneration, the crumbling temple, seeking allies and useless allies. All which I have completed.

So how do I complete 5 adventures? What is meant by the term "variant"? I read that free to play adventures don't count (which two of the ones I have open are), so will just repeating one of the adventures (non free to play) open these other missions?

Thx