EvoType

Evolution Types
There are four evolution types for Mercenaries. A Mercenary that is type C-A can be systematically evolved from C -> B and then from B -> A.
 * 1) D - A
 * 2) C - A
 * 3) B - SS
 * 4) A - SS

At Grade A, the Mercenary cannot be systematically evolved any more. But, the mercenary can still be used in random evolution!