Just like with other Nintendo games, amiibo provide you with special content that can only be accessed through the figures.
Fire Emblem Echoes amiibo: Here's what you get
From the official Nintendo site, we can see specifically what the Alm and Celica amiibo unlock within the game:
Each figure unlocks a special dungeon where players can battle bosses and collect in-game items.
Players can save the current strength of Alm or Celica in the game to the corresponding amiibo figure.
During combat, players can sacrifice a portion of Alm or Celica's health in order to summon a computer-controlled illusory hero that will act as a temporary ally for a single turn.
The amiibo for other Fire Emblem characters will also work in the game, so if you have a Marth or Corrin amiibo lying around, make sure to grab it for a bit of extra help in battle.
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