There are nine factions in BattleForge, each represented by a different color combination. Four of the factions are monocolored, requiring at least some orbs of one color. The other five factions are dual colored, requiring at least orbs of two different colors. Legendary cards do not belong to any faction and can be summoned with any orb colors.
Each monocolored faction has a different soundtrack that plays depending on the first orb summoned in a match. Monocolored units from the Twilight Edition have special voice lines if units from other factions are nearby.