Attribute Upgrade

Heroes can be used to increase other Heroe attributes too, for each Bonus Level it requires the quantity of heroes and the ZDCOIN. The costs in ZDCOIN, the quantity and rarity of Heroes to be sacrificed to upgrade the Attribute are explained in the following table.

Attribute Score	Heroes Sacrificed	ZDCOIN Price
9-10	1 Common	10
11-12	3 Common	20
13-14	5 Common	30
15-16	2 Uncommon	50
17-18	5 Uncommon	75
19-20	1 Rare	100