Gyak Siithis was a male assassin who worked for the Assassin Lord. He was present during the attack and kidnapping of Mal-Kenobi and Robbi Skywalker, but was able to escape Mal-Kenobi's wife Jenna's wrath. He reported his failure to the Assassin Lord (as he was supposed to obtain Skywalker's Kyber crystals). Zak considered feeding him to his pet dragonmount, who drooled when seeing Gyak. Fortunately for Gyak, his meeting was interrupted with the arrival Aerian. Aerian had a baby in his arms and said to Zak that it was the son of a Skywalker, Zak let Gyak go. Gyak left promising to get the crystals.