Abigail

Abigail is Wendy's twin sister, and as Wendy's perk, she will appear occasionally at night

Abigail will defend Wendy by killing any hostile mob at night, but if Wendy comes too close to her, Abigail will damage and possibly kill Wendy. Abigail does try to keep her distance, however.

Using Abigail to kill mobs is an effective method to avoid being killed, however, Abigail can die during the night if she is killed by an enemy. When fighting a ghost Abigail will die simultaneously with the ghost. If Abigail dies, she will not recur for at least 5 days. Each second she takes damage increases her lifespan so sometimes she won't despawn in the morning immediatelly.

If she attacks spiders, pigs, or beefalos she doesn't aggro the whole group.

Upon being dealt damage Abigail turns yellow. You can kill her using Right-Click on PC or CTRL+click on Mac.

Abigail can damage a spider lair but she will annihilate it as if it was burned.

Bugs

 * There is a small chance that two of Abigail can spawn at once.