What are the benefits of merging a unit?

While playing the game, I've found myself down to the option of unit merging, and wondered what does that imply?

Why should I merge units?

What are the benefits of doing it?

Solution 1:

There 3 situations with different outcomes:

Merging two units of same potential (4* into 4*, becomes 4*+1)

• SP gain (40 for 3*, 80 for 4*, and 120 for 5*)
• Inherited skills are passed on, learned and unlearned both, including weapons
• 2 points of stats gain
• You get to chose the hero with the best IV to keep, improving him/her even further
• Feather discount for increasing potential (150 for 3*, 300 for 4*)

The optimal out of the three options, as you are literally getting every benefit possible from ally merging.

Merging a higher potential into a lower potential unit (5* into 4*, becomes 4*+1)

• SP gain (40 for 3*, 80 for 4*, and 120 for 5*)
• Inherited skills are passed on, learned and unlearned both, including weapons
• 2 points of stats gain
• You get to chose the hero with the best IV to keep, improving him/her even further
• Feather discount for increasing potential (150 for 3*, 300 for 4*)

Keep in mind that the hero potential will not increase, therefore it will still have the same maximum status as a 4* hero. A 5* hero is equivalent to its 4*+5 version.

Merging a lower potential into a higher potential unit (3* into 4*, staying 4*)

• SP gain (40 for 3*, 80 for 4*, and 120 for 5*)
• Inherited skills are passed on, learned and unlearned both, including weapons

May be useful for players who were investing in a unit and got a version with higher potential afterwards. Also, it may come in handy if you need that extra SP to save some of your time.