Isa

Isa (short for Isaline) is a friend and companion to Siris. She was introduced to the series in Infinity Blade: Awakening, later appearing in Infinity Blade II.

Isa is not native to Lantimor. She traveled there in conquest of the Infinity Blade for unknown reasons. Isa speaks in a foreign dialect, and frequently makes errors when speaking in Lantimor's native language.

She usually uses a crossbow as her primary weapon, but she has shown the ability to take down a large beast with her bare hands. At the end of Infinity Blade II, she is also shown approaching Saranthia with a staff.

History
"Who is she? [Raidriar] thought idly. Which one does she serve? His query to his deadmind ledgers had returned no results. She wasn't Deathless—or if she was, the ledgers had no record of her face."

After the events of Infinity Blade I, Isa raided the God King's castle in search of the Infinity Blade. When Siris returned to the area, he was attacked by Isa, who attempted to steal the Blade from him. After failing to procure the weapon, Isa convinced Siris to take her as an ally. She promised to lead him to the Worker of Secrets in exchange for the Infinity Blade if he died on his journey (though not by her hand).

Isa and Siris began growing closer as they traveled. At one point, Isa again attempted to steal the Blade while Siris slept, holding her crossbow to his head. Foreseeing the incident, Siris had attached a transportation disk to the bow's trigger mechanism. He summoned the disk after awakening, disabling the weapon. After she attempted to fire the broken crossbow, Siris told her to leave.

Isa begged him to allow her to stay. She stated that she wouldn't mind being tied up at nights if he would keep her as an ally. Although she had lost his trust, Siris was aware that Isa remained crucial to his mission if he was to find the Worker. He agreed to continue traveling with her as long as she led him to Saydhi, the information dealer. After tensions settled, they continued to exchange casual, friendly conversation as they had before.

Along their journey, Isa and Siris heard a call for help. Against Isa's wishes, Siris jumped into the clearing in an attempt to handle the situation. He saw a traveler surrounded by enemies, which he engaged in combat. Instead of running, Isa tried to assist Siris. By inhibiting an enemy, she saved Siris's life, but she was seriously wounded. The traveler (revealed to be TEL) agreed to heal her, but she did regain consciousness for some time.

When Isa did awaken, Siris forgave her for her past treachery, stating that "saving my life negates an attempt on it". They continued traveling until they reached Saydhi's Estate. Isa agreed to stay back while Siris entered and dispatched Saydhi's guards. After killing Saydhi herself, Raidriar appeared and tricked Siris into handing over the Infinity Blade. As Raidriar prepared to strike with the blade, Isa fired a crossbow bolt into Siris's forehead.

Siris awoke in a nearby rebirth chamber, Isa sitting beside him. She stated that she had known Siris was Deathless, based on his use of rings and his fighting ability. She cited this fear as the reason she had betrayed him, and as the reason she had killed him before Raidriar could strike - once fully charged, the Infinity Blade is able to permanently kill any Deathless. Isa sullenly departed, telling Siris that she was going to continue hunting the Infinity Blade.

She is not seen again until the end of Infinity Blade II, after Siris is betrayed by the Worker of Secrets. At the end of the credits, Isa is shown walking up to the castle, in the same way that Siris does whenever a new Rebirth begins.

Trivia

 * Isa's horse is named Nams.