Gems are used to level up Mercenaries. As a Mercenary's level increases, so too does the cost of feeding the Mercenary gems. Additionally, higher-ranked Mercenaries tend to cost more to level up than lower-ranked ones.
Experience given by a gem depends on the type of mercenary the gem is being given to, and the tier of the gem itself:
- Red Gems: Attacker
- Blue Gems: Defender
- Green Gems: Healer
- Purple Gems: Supporter
- Black Gems: Special
|Gem Type||EXP to Same Type||EXP to Different Type|
Note that for every level increase, the cost (in gold) for applying each gem will marginally increase. So, it tends to be more economical to level up mercenaries by applying 6 gems at once or only using higher tier gems. If you are close to next level, it may also be a better idea to forgo the stat boost from the next level and maintain current level for cheaper leveling cost.
Please visit the Gem Costs page for further info!
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