Core Build
You get stats in Dragon Raja by setting up your core up with gems.
There are 4 gems –
Fire/Red: INT
Water/Blue: INS
Wind/Green: DEX
Earth/Yellow: CON
Each class will use different setups based on the stats that they need (stats change per class).
Here are some setups for the different classes (not the only way to set up, they can definitely be changed!)
Blademaster:
9 Fire/Red
5 Water/Blue
2 Wind/Green
Since Blademasters are tanks/DPS and already have good base stats for HP/DEF, Earth isn’t really needed. Fire and Wind are for the DPS aspect and Water is for CDR.
Gunslinger:
9 Wind/Green
5 Fire/Red
2 Earth/Yellow
Crit is really important for Gunslingers so they use lots of Wind and as DPS’s they need Fire. Since they need a bit of HP/DEF Earth is good to have.
Assassin:
9 Fire/Red
5 Wind/Green
2 Water/Blue
Assassins mainly use Fire as they also are a DPS. Sins also need quite a bit of Crit so have enough Wind.
Soul Dancer:
Soul dancers need MATK (for healing/buffs and DPS) so they have more Fire. They need CDR from Water and lack a bit in HP/DEF so also need Earth.

Example
Fire side from an SD core → bottom gems will remain the same on all sides of the core