Just found out about the game, but I am a little confused by Duels. Anyone care to illuminate me on the differences?
Grimslingers: Duels is just a microgame version of the versus mode in "Grimslingers" (the core game).
So, in duels you have enough cards for 2 players, and each only has the 6 elements. In the full game, you can play up to 6 players, and you can have element spells, signature spells, items and archetypes.
Duels also works as an expansion to the core game's versus mode, allowing it to go up to 8 people for bigger gaming groups.
Hope that helps!