Combine and Evolve

How these two upgrades work?

Legend:
MU = Maxed up Unit - a 30 lvl +5 unit.

AU = Attribute upgrade (unit's atribute upgrade for the green crystals)

GP = Giant Phase.

SP = Skill Phase.

COMBINE.
To Combine two units those units must be MU. Combined unit will be +1 star random unit (7* max), which will save AU rounded down and Giant Phase rounded down. It WILL NOT save a Skill.

For instance You have a Level 30 5* Swordsman+5 with GP 3, AU in Attack 2 lvl and a Level 30 5* Berserker+5 with GP 1, AU in Attack 1 lvl. After Combine you will receive a new random 6* unit with Giant Phase 1 and 1 upgrade in a random attribute. It also has a miserable chance to get a Skill (even if units You have combined didn't have a Skill)

Combine is a good way to get rid of the nasty F-B ranked units. Or to get a quick upgrade line to 5 to 6* for sacrificing to Giants/Skills...

EVOLVE.
To Evolve you will need two identical MU. Evolved unit will be a +1 star better of the MU you used, which will save GP rounded down, AU rounded down AND SP rounded down. (only if both units had Skills, Evolving Necklace doesn't have a Skill).

Slow upgrading, but steady and conscientiously.

Related stuff:

 * Units 
 * Gunners 
 * Upgrades 
 * Spells
 * Enhance 
 * Giant Upgrade 
 * Skill Upgrade