Canis

Elf is one of the 12 Dark Warlords.

In Fire Emblem: Seisen no Keifu, little is said about the Dark Warlords, but they are all fought in the Final Chapter near Barhara, and eventually defeated, including Elf.

In Fire Emblem: Thracia 776, Elf is fought in the Final Chapter. The character that becomes Elf is Sara if Sara is either dead or not recruited.

Seisen no Keifu
Elf has a Resire tome, so you will want to attack her with someone who can either attack and likely defeat her before she can attack, like Shanan with the Balmung or Lakche with a Brave Sword, or you could use the Sleep Staff or the Silence Staff on her and defeat her with ease.

Base Stats
|Shaman |30 |80 |13/21 |N/A |20 |20 |4 |16 |23 |5 |Staff, Light


 * Items: Resire
 * Skills: Pursuit, Critical
 * Leadership Stars: 0
 * Gold: 2000
 * Holy Blood: None
 * Staff Mastery Rank: B
 * Light Magic Mastery Rank: A

Thracia 776
Elf is considered by some as the most dangerous of the six Dark Warlords in the Final Chapter. At least with Nwei you can kill him at a range, but you will get counterattacked by Elf and with her deadly collection of skills, including Wrath, she'll likely kill you unit on counterattack, and if you wait too long, she will use her Berserk Staff. You should try to get Mareeta placed close to Elf, and just have her kill her with Mareeta's Sword. If that's not possible, you might want to warp Mareeta over to Elf to defeat her that way. If you didn't train Mareeta or you don't want to use a Warp Staff or simply don't have one, you may want to hope for a lucky critical hit or have someone who can dodge well, like Sety, attack her and hope she will miss. But really, anyone who doesn't use Mareeta is insane.

Base Stats
|Sage |20 |36 |3/20 |7 |20 |17 |13 |6 |20 |7 |Stave, Fire, Thunder, Wind, Light


 * Items: Resire, Berserk Staff
 * Skills: (Continue), Wrath, Prayer, Elite
 * Leadership Stars: 0
 * Movement Stars: 0
 * Pursuit Critical Coefficient: 0
 * Stave Mastery Rank: A
 * Fire Magic Mastery Rank: A
 * Thunder Magic Mastery Rank: A
 * Wind Magic Mastery Rank: C
 * Light Magic Mastery Rank: A