Synergies or unit combos grant powerful status effects when you place certain units from the same class or faction on the game board. There are two types of synergies – class synergies and faction synergies. Before we delve more into this, let’s know a bit more about classes and factions.

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Classes
There are six classes in Might & Magic: Chess Royale: Spirit, Warrior, Guardian, Mage, Assassin and Dragon. Units from a class share certain common traits. For example: Warriors have high DPS, whereas Guardians are tank characters. When you place units from the same class on the game board, a class synergy is activated, which grants powerful buffs or de-buffs.
Factions
If you have played Might & Magic: Heroes, then you will be familiar with factions. There are six factions: Fortress, Haven, Necropolis, Stronghold, Dungeon and Sylvans. “Heroes” had an alignment system, in which a unit or group of units from a faction determines whether they are “good-aligned”, evil or neutral. For example: Units in the Haven faction are “good-aligned”, Necropolis faction units are bad and Stronghold units are neutral. In Heroes, these factions had their own story-based campaigns.
In Chess Royale, the focus is more on synergies so a group of 3-4 units belonging to the same faction grants powerful buffs when they are placed on the chess board.
To activate class synergy, you will have to place a certain number of units that belong to the same class. Class synergies can be activated even when you place only half of the units on the chess board. Example: If you place 2 warriors on the board, then all warriors will gain 20 percent bonus damage. But if you place 4 warriors, the damage will increase to 50. But in case of faction synergies, you must have full units from the same faction on the board to activate them.
Here’s a complete list of Might & Magic: Chess Royale synergies. Make sure you fulfill class and faction synergy requirements to activate.
Class Synergies
Spirit
2 Units: (-3) armor to all enemies
4 Units: (-5) armor to all enemies
Spirit units: Ghost, Troglodyte, Lava Elemental, Dryad
Warrior
2 units: All warriors gain 20 percent damage
4 units: All warrior units gain 50 percent damage
Warrior Units: Gnoll, Orc, Valkyrie, Fire Giant
Guardian
2 Units: All guardians gain +4 armor
4 Units: All guardians gain +10 armor
Guardian units: Battle dwarf, Swordmaster, Treant, Cyclops, Archangel.
Mage
2 Units: (-10) percent magic resistance to all enemies
4 units: (-30) percent magic resistance to all enemies
Mage units: Druid, Rune Priest, Lich, Zealot
Assassin
2 Units: All assassins will have 5 percent chance of a critical hit, which will deal 300 percent DMG.
4 Units: All assassins have 20 percent chance to critical hit, which will deal 300 percent DMG.
Assassin Units: Justicar, Harpy, Vampire, Stalker
Dragon
Placing only one dragon unit will activate this synergy. When you place a dragon unit on the board, it will grant +40 mana to nearby allies on the chess board.
Dragon Units: Hydra, Green Dragon, Red Dragon, Bone Dragon
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Faction Synergies
Fortress
Place 3 units from the Fortress faction to get a 20 percent chance of earning 1 extra gold after a kill.
Fortress Units: Lava Elemental, Fire Giant, Valkyrie, Battle Dwarf, Rune Priest, Red Dragon
Haven
4 Units: All Haven units survive only for 3 seconds after dying.
Haven Units: Archangel, Swordmaster, Zealot, Justicar.
Necropolis
Upon death, all Necropolis units spawn a 2-stars Ghost.
Necropolis Units: Ghost, Lich, Vampire, Bone Dragon
Stronghold
You will need 3 units from the Stronghold faction: When a stronghold unit dies, a random stronghold unit on the board gains +100 percent DMG
Stronghold Units: Gnoll, Orc, Cyclops, Harpy.
Sylvans
4 Units: When attacked, Sylvans have a 15 percent chance to deal 150 DMG to every nearby enemy on the board.
Sylvans Units: Dryad, Treant, Druid, Green Dragon
Dungeon
3 units: When a battle begins, a random ally unit gets duplicated. Allies up to max 2 stars will be duplicated.
Dungeon faction units: Troglodyte, Stalker, Hydra