Sacred Crystals (SC) are the Premium in-game currency. They provide a number of valuable functions that enhance the game experience.
There are several methods to obtaining Sacred Crystals:
- The majority of missions provide one SC for obtaining 3 stars.
- Story missions will also grant an addition SC for completing the challenging 4 star version of the mission.
- A few SC can be obtained every month as login bonuses from the Stamp Card, depending on the level of the card (up to 5/month for the normal card.)
- SC may also be purchased from the Shop using real money.
SC purchased using real money expire after 180 days. SC obtained via in-game methods have no such expiration date. When spending SC, whether at the Shop, Shrine, or refilling Charisma/Stamina, purchased SC will be consumed before SC earned in-game.
You can only carry 299 Sacred Crystals at a time. This means you will not be able to purchase two 150 SC packs back to back.
There are two Premium summoning options available, which make acquiring rare units easier. For an in-depth look, see Shrine.
In the Shop, players can buy permanent additional slots for their barracks, at a rate of 4 slots to 1 SC. In addition, there are temporary buffs available for purchase that give you +30% melee unit atk, +30% ranged unit atk, -30% damage taken, 1.2x Exp, or 1.5x Gold for 3 SC each or +5 Unit points at the beginning of each battle for 1 SC.
For 1 SC, players can refill their Charisma or Stamina. Any excess is retained, allowing players to exceed their maximum Cha/Sta until said excess is spent.
It is best to refill stamina immediately after gaining a point through natural regeneration to avoid 'wasting' time. For example, refilling stamina when you're 5 minutes away from gaining a point will result in the timer being reset, making you miss out on the last 55 minutes that had been spent regenerating that one stamina.