Just like Spectrum said,4 new lairs to explore with epic bosses at the end.2 inner boards,one lair each side.Or any small expansion is a welcome.The reaper,blood moon,harbinger are my favorites.
I would like Timescape to be a game of it's own though, based on Talisman mechanic of course.
As Artaterxes pointed out - this game exists:
https://www.fantasyflightgames.com/en/products/relic/