Sub-Card

The first sub-card slot that can be unlocked is at player's level 30 and is only applicable to leader(Ace). The rest of sub-card slots are subsequently unlock when player's level reached 60, 90, 120 and 150.
 * Sub-Card boost the main card stats and affect it's skill accordingly stated.
 * Sub-Card level and grade will affect how much stats the main card can receive.
 * Sub-Card cost is added into main card cost, thus adding into total deck cost.
 * N/R card can hold up to a maximum number of 1 Sub-Card.
 * S/SS card can hold up to a maximum number of 2 Sub-Cards when evolved twice.
 * SS card can hold up to a maximum number of 3 Sub-Cards when evolved 3 times.

The following table shows Sub-Card slots unlocking correlated to player's level: