The 
Aum Staff (オームの杖 Ōmu no Tsue called the Ohm Staff in the Japanese version) is a powerful staff that can resurrect the dead. It appears in Fire Emblem: Ankoku Ryū to Hikari no Tsurugi and its sequel and remakes and can only be used on the final chapter, but with a single use before it breaks, it is a staff to be used wisely. The character comes back with the same stats as they had when killed, but at full HP and free of status conditions. It originally could be only used by Elice, although in Shadow Dragon and Shin Monshō no Nazo ~Hikari to Kage no Eiyū~ it can be used by the other princesses (Maria, Minerva, Yumina, Nyna, Shiida, and Sheema) as well, if they are the right class.
It cannot be used to bring back the character which was used as a decoy in the prologue of Shadow Dragon.
Stats
Fire Emblem: Ankoku Ryū to Hikari no Tsurugi
- Uses: 1
- Range: --
- Weapon Level: 1
- Worth: --
- Effects: Elice-only, revives a fallen ally (Chapter 24 only)
Fire Emblem: Monshō no Nazo
Book 1
- Range: --
- Experience: 58
- Uses: 1
- Weapon Level: --
- Worth: 10000
- Effects: Elice-only, revives a fallen ally
Book 2
- Range: --
- Experience: 58
- Uses: 5
- Weapon Level: --
- Worth: --
- Effects: Elice and Yumina only, revives a fallen ally
Fire Emblem: Shadow Dragon
- Rank: A
- Range: 0
- Weight: 0
- Uses: 1
- Worth: --
- Weapon Experience: 2
- Experience: 100
- Effects: Princesses only (Shiida, Minerva, Maria and Elice), revives a fallen ally
Fire Emblem: Shin Monshō no Nazo ~Hikari to Kage no Eiyū~
- Rank: A
- Range: 0
- Weight: 0
- Uses: 1
- Worth: --
- Weapon Experience: 2
- Experience: 100
- Effects: Princesses only (Shiida, Minerva, Maria, Yumina, Nyna, Sheema, and Elice), revives a fallen ally
Etymology
It is named for a heavily religious symbol in Asia.