4 cards are Advanced Action cards, which can be charged with 2 different colors, the last card being an artefact.
Four of the cards are dual colored:
- Explosive Bolt
- Chilling Stare
- Rush of Adrenaline
- Power of Crystals
Each of these cards allow you to spend either type of mana shown on the card in order to play them or activate their stronger effect. They also count as both colors for certain effects.
The fifth card is a new artifact, the Mysterious Box.
For more information, please refer to the BGG listing.