Res Arcana: Lux et Tenebrae

Rarely do I like expansions, but this one -- after initial scepticism -- turned out to enrich the game once we were experienced enough with the basic game. Keeper.

More mages, more monuments, more artifacts, more magic items, minimal rule additions. Perfect.

Une extension qui augmente les possibilités stratégiques sans dénaturer le jeu de base

The 10 is more an indication of the original quality of Res Arcana, and that game happens to be one of the best engine builders ever made. Lux is a solid "extra content" sort of expansion, allowing for more surprising combinations and possibilities. This is still an amazing game to me in how lean it is in any given session, but how varied the strategies can be. Anyway, nothing here detracts from that, and it helps the game scale a bit better.

RA: Lux et Tenebrae adds demons as a third dimension of cards, which doesn't affect the difficulty much IMO. I usually keep these cards in the deck even when playing with new players, it hasn't lead to problems so far. More importantly though, it adds scaling per player (leading to tighter games) and some "back-up" options with lower efficiency in the scrolls. The latter IMO helps in making play more consistent, especially with high player counts (where other players could previously accidentally block you from doing something). I really enjoy the new strategies and tactics added by this expansion!