Upgrade

Users can only upgrade:

1. S-Rank Monster Card

2. Shadow Army Cards (SB and SA-Rank Only)

Shadow Army Cards Rank [SB-Rank < SA-Rank < SS-Rank]:

S-Rank Monster Cards can be upgraded to SB-Rank Shadow Army Cards.

For higher ranks, users can use Essence Stones to upgrade:

• SB-Rank Shadow Army Card for a chance to obtain SA-Rank Shadow Army Card.

• SA-Rank Shadow Army Card for a chance to obtain SS-Rank Shadow Army Card.