Lack is the tenth chapter of Book IV in Fire Emblem Heroes.

The five parts of this chapter are Having Grown, Path of Faerghus, Path of Almyra, Path of Adrestia, and To Feel Loved.

Part 1: Having Grown

Subjective: The following part of this article is based upon the editor's personal experiences and opinions, and therefore may not be applicable for all readers.

You will have 4 units on your team. You will also have 5 opponents: Lysithea: Earnest Seeker, an Emblian Axe Dragon, an Emblian Bow Cavalier, an Emblian Bow Fighter, and an Emblian Lance Flier.

Part 2: Path of Faerghus

You will have 4 units on your team. You will also have 5 opponents: Dimitri: King of Faerghus, an Emblian Sword Cavalier, an Emblian Cleric, an Emblian Axe Knight, and an Emblian Bow Flier.

Part 3: Path of Almyra

You will have 4 units on your team. You will also have 5 opponents: Claude: Almyra's King, an Emblian Lance Cavalier, an Emblian Axe Fighter, an Emblian Axe Dragon, and an Emblian Red Cavalier.

Part 4: Path of Adrestia

You will have 4 units on your team. You will also have 5 opponents: Edelgard: Adrestian Emperor, an Emblian Lance Knight, an Emblian Sword Dragon, an Emblian Red Mage, and an Emblian Bow Cavalier.

Part 5: To Feel Loved

You'll have to finish this map within four turns. You will have 4 units on your team. You will also have 4 opponents and 1 boss: Freyr, Dimitri: King of Faerghus, Edelgard: Adrestian Emperor, Claude: Almyra's King, and Lysithea: Earnest Seeker.

Trivia

• The characters featured in this map are the winning top two women and top two men of the fourth Choose Your Legends voting event.
• This is the first chapter to feature Brave Heroes, as Brave variants of Heroes were introduced in Paralogues rather than story chapters.
• The music playing in Parts 1-4 of this chapter is Chasing Daybreak from Fire Emblem: Three Houses.
• This is the 7th chapter where a major character dies, in this case Freyr.
  • Freyr is also the first boss who does not attack at all, as he does not have any skills equipped.
    • At the time of his appearance in this chapter, Freyr's attack art was not even present in the game because of this.