Defenders of the Realm: The Dragon Expansion provides the means to ramp up, ease up, expand and customize your Defenders of the Realm gaming experience in a variety of ways. The three new Dragon Generals (Onyx - black, Hemlock - green, Brimstone - red) can be used with Sapphire, the original blue Dragon, in a struggle that will severely test the mettle of the Heroes of the Realm. The new General card for Sapphire gives her an additional hit point for each other Dragon in play.
You can also mix and match the new Generals with the existing Generals. The new Generals minions' each have their own special abilities:
Onyx's (black) Zealots go berserk when fighting - the survivors together dealing one point of damage after each combat action. You'll still take a wound from each if you remain in the same area with them at the end of your turn.
Hemlock's (green) Imps propagate quickly (whenever you place an Imp, another one pops up in every adjacent space) and steal a random card from you if you remain in the same space with them at the end of your turn.
Brimstone's (red) Fire Elementals spontaneously combust whenever three of them get together, setting the area on fire. Areas on fire require 2 Actions to move into, taint whenever three minions are present, instead of 4 and deal wounds to Heroes remaining in the area at the end of their turns.
The Generals each have their own special nastiness as well. For example, Brimstone, instead of moving along the usual red-General path, moves every time her card comes up when Darkness Spreads, flitting here and there and setting the world on fire. Players can lose cards when attacking Hemlock.
Any of the new dragons can also be used as an Agent of the Dark Lord when playing with at least one of the original Generals (Varkolak, Gorgut, or Balazarg). You can add up to 5 of the 10 Global Effects Cards (5 Good, 5 Bad) to the Darkness Spreads deck to adjust the toughness of your campaign. Likewise, a number of Royal Blessing Tokens (4 max) can also be added to the game. Royal Blessings allow players to either ignore a Darkness Spreads card, remove a taint crystal or prevent a General from moving.