The Immortal Knight during Queen Gimnax's rule of Nalos.

She is well loved by the people of Wildwood. Winners of varying contests throughout the city often are awarded coins bearing her image. - Festival of Heroes (GS-ADV1)

The procession is led by Imbri, the Immortal Knight, champion of Ulos, sitting astride her white horse. - Festival of Heroes (GS-ADV1)

Both the Queen’s Guard and the Gnolls bow respectfully when they see her. The famed adventurer is respected by both loyalists to the crown and the queen’s detractors. - Explorers Guide (GS-Guide-ADV1-2)

You find Gulpax’s Journal while investigating the antechamber of the Gurlung Colossus. She has made several mentions of the Immortal Knight being concerned with her experiments.

During the Festival of Heroes procession and fanfare, a Werewolf leaps into the parade and disrupts the celebration;

The Immortal Knight is thrown from her saddle when her horse rears, kicking its front legs wildly. Here you catch a better glimpse of the assailant — a Werewolf slashes the horse’s flank then barrels towards an old woman. - Festival of Heroes (GS-ADV1)

If overpowered by Arnon in his Werewolf form at the Temple of Shintal, you bear witness to him attacking Imbri as well;

She pulls the beast off of you and the Werewolf slashes her face and neck with its claws. The knight staggers back as the wolf disappears into the shadows, his mother trailing after him.

Still bleeding, the knight gives chase, leaving only a broken Werewolf fang behind. You hope that she seeks out a healer. If her wounds are infected, she may soon share the Werewolf's curse. - Festival of Heroes (GS-ADV1)

Once chosen to join the Heroes Guild, Imbri sends you to Sabek on your next quest.

Standing in Queen Gimnax's throne room, you learn that Imbri has been captured by the Insectoids. You must travel to Ty Farzan to search for her. Many fear that she was infected by the Werewolf's bite…or even worse, dead.

Nayo, the cartographer, informs you that she saw Imbri being carried into the hive by an insectoid drone.

Sneaking into the hive, you find her immersed in a pool of blue ichor. Assuming the worst, you may either:

• Fight Laz'arax to free her from her captors.
• Attempt to negotiate for her release.

In either case, you discover that Imbri was not a prisoner of the Insectoids. Instead, they have been attempting to heal her from the many wounds suffered from her fight with a would-be assassin.

While exploring the Saurian Wasteland, you discover a secret cavern. There, you find Imbri and Nayo. They have captured Awook, a Dragul agent who has been paying the Order of Assassins to thin out the ranks of the Heroes Guild.

Imbri's wounds appear to have fully healed.

Landrus and his crew discover Imbri's body in the Frozen Expanse. There are many rumors as to her ultimate demise:

• She had succumbed to the Werewolf's curse and you were forced to kill her.
• You have secretly been working for the Dragul Alliance so you could get close enough to assassinate her.
• She is crushed under the grip of a Frost Giant.

There are even rumors that she is still alive. But those rumors are few and far between.

Some rumors exist that Imbri was seen fighting in the Arcazion Pit.

“The Immortal Knight remained loyal to the queen, but she was heartbroken to see Ulos torn apart by war. The horrors of the battlefield haunted her for the rest of her life.” - Eklar - The Scrying Pool (GS-Epilogue)