Surendranath Santaraksita is a librarian from Taglios who becomes a prisoner, and then ally, of the Black Company. He was a member of the bhadrhalok, the intellectuals who oppose Soulcatcher's Protectorate in Taglios.
Master Santaraksita is given the first Annals of the Black Company by the Radisha and told to destroy them, but he cannot. His unwillingness to destroy books would later allow the Black Company to recover them before they left the city to reanimate the Captured.
Santaraksita learns that Sleepy can read, who is posing as a young, male janitor named "Dorabee" for the library. He is shocked that somebody not of the priestly caste is capable of literacy. He tests Sleepy's aptitude on several occasions and tries to seduce her, still thinking she is male. In one incident, Master Santaraksita is accompanied the library's gate man, Adoo, in search of "Dorabee". Adoo led the old man near the warehouse of Banh Do Trang that was being used as the Company's secret headquarters, but the two were effectively immobilized by the "confusion net" of disorienting magic spells. Banh Do Trang notified Sleepy of the intrusion, and, Tobo successfully lured Adoo and Master Santaraksita out of the net to safety, protecting the group's anonymity.
Later, Master Santaraksita and the copyist Baladitya are kidnapped by the Black Company and forced to translate their older annals. The Company brings them onto the Plain of Glittering Stone and into the Fortress With No Name. Santaraksita is present with Sleepy, Goblin, Tobo, and Suvrin when they encountered Kina in person for the first time, in her prison chamber far beneath the Fortress. They fled in abject terror when Kina attacked them with fiery wisps of sorcery. Goblin sacrificed himself, impaling Kina with the Lance of Passion, to buy them time to flee back up the daunting staircase.
Master Santaraksita joins the monks of Khang Phi after the Company reaches Hsien. At Khang Phi he finally finds the intellectual challenges and wise people he has always wanted to spend his days surrounded by. His last act as an associate of the Company is to help them steal the knowledge to repair shadowgates from Khang Phi.