Fighting the Undead
Energy is the Resource that must be spent to fight the Undead. Each battle requires 10 Energy.
There are 20 Levels of Undead. In most cases you will maximize your rewards (Champion XP, Summoning Bonds, and Energy) if you defeat the Undead in a single attempt.
Each Undead has a certain amount of HP. In turn, each of your Champions has their own Attack Power statistic. If the Champion's Attack Power is greater than the Undead's HP, the Champion will defeat the Undead.
When fighting the Undead, only the Level of your Champion is important. A Level 15 Champion of Grade III, Rank 6, will be just as effective as a Level 15 Champion of Grade I, Rank I.
PvP Battles
When deploying your Units on Offensive or Defensive missions, you can send Champions whose type fits the mission. This will boost the army's combat statistics.
The Bonuses given by a Champion are calculated on top of other Unit-enhancing bonuses, meaning that an upgraded Champion can provide a huge boost to your army.
Champions at your Castle
You can station up to 6 Champions at your Castle to strengthen Castle Defense, or to improve Resource Production.
There may be many Champions in any given battle, but your army can only be represented by one Element in each. When 1 or more Champions are activated at the Castle, you can choose a "Dominant Element". If you do not choose a Dominant Element, deactivate the Champion with the Dominant Element, or this Champion is stunned, the army defending your Castle will remain without any Element.
If your Castle is successfully attacked, the Champions you had activated at the time will be left stunned.