Fire Emblem Fates: Birthright (Nintendo 3DS)

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Einherjar cards

Complete the storyline for the indicated path to be prompted to choose five characters to save as Einherjar cards. They can then be used to purchase Skills or Characters on another path. They characters are selected from those who are available at the end of the game.

CardHow to unlock
Birthright Character Einherjar cardsComplete the End Game on Birthright.
Conquest Character Einherjar cardsComplete the End Game on Conquest.
Revelation Character Einherjar cardsComplete the End Game on Revelation.

Free units and gold

Have an open saved game slot. Also backup your current saved game to recover in the event of an error. Go to the Einherjar Shop and purchase any desired unit(s). Save the game into the open saved game slot. Hold L + R and press Start to restart your system. Reload your original saved game file. Delete the file that was created in the open saved game slot. You will retain unit(s) that were purchased in your Unit Logbook and no gold was spent on them. You can also use this trick sell items from your inventory to gain more gold to more purchase more expensive units.

Seals

After your character reaches level cap, you cannot gain any additional experience unless you change your class. There are a total of four Seals which can be purchased for 1 DVP at the Staff Store in MyCastle, found inside Treasure Chests, or obtained from random villagers. They have the following functions.

SealHow to unlock
Friendship SealChanges a class based on A+ support partner while retaining the same level.
Heart SealChanges a class based on personality while retaining the same level.
Master SealUpgrades a class from Level 10 onwards to a higher class.
Partner SealChanges a class based on S rank support partner while retaining the same level.