Fire Emblem Heroes has received a content update for March 16th, 2022. You can see full details on this update below.
[Summoning] A returning Summoning Focus is now live: Familial Festivities It features the following Special Heroes: Est (Springtime Flier), Narcian (Vernal General), Fir (Student of Spring), and Idunn (Dragonkin Duo) (available until March 26th)
[Special Maps] As part of the latest set of Limited Hero Battles, the Grand Hero Battle feat. Bertram (Dread Cavalier) is now live (available until March 21st)
[Events] The Shield Phase of the latest Mjölnir Strike event is now live (available until March 18th)
[Quests] A new set of Quests is now live: Mjölnir Strike (available until March 18th)
[Manga] Chapter 222 of the official Fire Emblem Heroes manga is now available: click here to check it out! (no end date)