刺客信条：血统（Assassin's Creed: Bloodlines ）是一款于2009年推出的PSP游戏，它是2007年发售的刺客信条的直接续作。它于2009年11月17日在美国发售，同年11月20日在全球发售。
阿泰尔到达利马索尔，并与他的部下提到的线人亚历山大进行了联系。 亚历山大与他讨论了圣殿骑士的存在，并制定了计划以收集更多的信息 。
Altaïr consulted with Osman, a resistance spy within the Templar's ranks, and managed to lower the defenses of the Templar-controlled Limassol Castle, in order to infiltrate the castle with ease. He was also able to learn of a certain archive that the Templars were keeping a secret, though if he wanted to learn more, he would have to seek out Frederick the Red.
Altaïr entered the castle and encountered Frederick, though he gained no information before his target's death. Heading out of the structure, Altaïr saw that the safe house of the resistance had been burned to the ground by the Templars, and, after searching the area, learned of Maria's survival.
Fleeing to the church area, Altaïr watched over an announcement being made by Armand Bouchart, the current Grand Master of the Templar Order, regarding the death of Frederick. Slaying Osman in the midst of his announcement, Armand threatened to tighten the grip of the government within the city if they refused to cooperate in searching for the murderer.
Just then, Maria arrived and pleaded to Bouchart for safety, though he attributed her safe escape as being in league with the Assassins. Despite her claims, Maria was taken away by Bouchart's men on the grounds of conspiring against their Order; though she was intercepted and rescued by Altaïr.
After regrouping by the city's harbor, Alexander helped Altaïr charter a boat for the city of Kyrenia, which was where Bouchart had fled. Consorting with Alexander's associate Pasha, Altaïr was able to make his way into the city with Maria.
Once Altaïr had arrived at the city of Kyrenia, he encountered the resistance member Markos, who helped stop Maria's escape attempt. Altaïr then left her to the care of Markos while he searched for the resistance leader Barnabas, the man mentioned by Alexander. Meeting with Barnabas, Altaïr was instructed to murder the claimed traitor Jonas, as his end of the deal for assistance in dealing with the Templars.
Intercepting Jonas, Altaïr learned before his target's death that the Templar figure Moloch had placed a price on both his and Maria's head. Learning of this, Altaïr made his way back to the harbor in order to ensure that she was safe. Rescuing her and Markos from harassers, Altaïr instructed them to make their way into the resistance safe house.
After this, Altaïr returned to the safe house and reported to Barnabas, who subsequently told him of a riot happening around the city due to Jonas' death. Barnabas claimed that Jonas was a well-respected man, though few knew of his treachery. Altaïr then explained that more of the resistance were making their way to the safe house, and that he should explain the situation to them.
Departing to deal with the riot, Altaïr was successful and immediately returned to Barnabas, though he found that he had disappeared. Seeing that Markos and Maria were safe, Altaïr decided to eliminate Moloch due to the threat he posed. Infiltrating Kantara Castle, Altaïr dealt with Moloch and escaped before he was caught.
At once, Altaïr returned to the safe house, though he learned that Maria and other resistance members were taken away by the Templars. Markos explained that the discovery of their hideout was the cause of the Dark Oracle, who was told to have mystical powers. He was also able to learn that the man he knew as Barnabas was a traitor, and that the real Barnabas was murdered before Altaïr's arrival. From there, he left the safe house to rescue Maria and the resistance members.
After successfully rescuing the men at Kyrenia's harbor, he was able to learn that Maria was taken away by Moloch's son, Shalim. After liberating the resistance members, Altaïr regrouped with Markos to report of the men's status. With the uncertainty of the Oracle's mysticism, Altaïr decided to explore the Oracle's supposed prison at Buffavento Castle. There, he overheard Bouchart and Shalim, who made mention of a delivery to Alexander, which Altaïr believed to be a sign of treachery. Dwelling further into the castle, Altaïr located the Oracle and had to assassinate her in her cell, as she attacked him in a crazed frenzy, before he left the castle.
Returning to the safe house, Altaïr asked Markos for information regarding Shalim. Told very little, he tasked himself with tailing Shalim to learn more about him. Following him, Altaïr witnessed him and his men harass the citizens of Kyrenia, and took it upon himself to liberate them. After doing so, he reported back to Markos, and learned that he regularly confessed at a nearby church. Conversing with a monk, he set up a meeting, but the monk was killed by a Templar assailant. Altaïr gave chase, though was only able to pick up one of the agent's belongings. Reporting to Markos, he learned that Shalim was frequently seen by the harbor, and decided to pick up where he left off by heading there.
Altaïr saw a group of beautiful women meant for Shalim's entertainment, and amongst them was Maria in disguise. Following the carriage the women rode on, Altaïr reached Saint Hilarion Castle and prepared to infiltrate the castle in search of Shalim. Just as he located Shalim, Altaïr saw Maria conversing with him, who talked about the Templars' intention with the Apple. Deserted by Maria, Altaïr prepared to duel both Shalim and his twin brother Shahar, who he thought was the former.
Dealing with the twins, Altaïr left the castle and reported back to Markos. Altaïr learned that Kyrenia had been fully liberated of the Templars, and that their fleets set sail for Limassol once more, to which he left in pursuit.
Altaïr located the newly rebuilt safe house and rendezvoused with Alexander, who immediately branded the Assassin as a traitor, much to his surprise. Altaïr explained the chain of events to Alexander, who subsequently told him of the Templars' abuse of power. Altaïr first dealt with the captain guards, then asked several of the pirates for Bouchart's whereabouts whilst posing as a Templar messenger.
Altaïr learned of a recent murder committed by a Templar sergeant and left to interrogate him. After doing so, he was pointed to Demetris if he wanted more information. Questioning Demetris, he learned that he was the perpetrator of the murder, though he was killed by the same agent from Kyrenia before he could reveal any more.
Unable to chase the agent, Altaïr returned to the safe house, though he only found a note from Alexander, instructing him to meet by the castle's courtyard. Doing so, he saw Alexander's corpse, and was greeted by the Templar agent, who was also the impostor of Barnabas.
The agent was able to turn the whole town against Altaïr, as a mob made their way to the courtyard ready to drive him out. With this, the Assassin was forced to utilize the Apple of Eden to drive the civilians away without casualty. After this, the agent asked for the Apple, though as he did, he was stabbed by Maria from behind.
After an argument, Maria informed Altaïr of the Archive's location, which was within the Castle premises. After dealing with a group of Templar soldiers, Altaïr proceeded into the Archive.
Arriving to the sight of Bouchart knocking Maria out, Bouchart mentioned their true plans and intentions. The Archive had existed while under Comnenus' rule, and because of his defeat by King Richard, the Archive was compromised. To prevent this, the Templars were forced to buy the island, and due to Altaïr's meddling, was also forced to liberate the artifacts out of it.
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- Miller, Greg (17 July 2009). Assassin's Creed: Bloodlines Deets. IGN. Accessed 4 Jan 2020.
- Neirinckx, Kristin (16 July 2009). NEW Limited Edition Assassin’s Creed: Bloodlines PSP Entertainment Pack. PlayStation.Blog. Accessed 4 Jan 2020.