Assembly hall
The Ngakpa Tratsang, also spelled Ngaba Zhacang, was the smallest of the three colleges that was set up in the complex. It was a three storied building originally built in 1419 by Jetsun Kunkhen Lodroe Rinchen Senge. It was refurbished in the 18th century by Lhazang Khan. Devoted to tantric studies, the college had an assembly hall and two chapels in the ground floor. The Assembly hall was built with four tall and 42 short columns with elegantly carved capitals. The main image in the centre of the hall was of Jamchen Chojey (wearing a black hat), founder of the monastery. It was believed that the Yongle Emperor (1360–1424) presented this image to Sera. Other images enshrined in the hall were of Maitreya, Gyeltsen Zangpo (first religious teacher of Sera), Pawangka Rinpoche, Tsongkhapa (with his principle disciples), Dalai Lama XIII, Chokyi Gyeltsen and Lodro Rinchen (founder of Sera Je). The two chapels housed many statues; in the Neten Lhakhang chapel of Shakyamuni Buddha along with images of 16 elders in double series (Upper series made in Tibetan style and the lower series in Chinese lacquer given by the Chinese Emperor); and the Jigje Lakhang chapel housed the 15th century image of Bhairava along with those of Mahakala, Dharmaraja, Shridevi and many others. While the third story was the residence of the Dalai Lama, the second floor had the images Amitayus and also eight 'Medicine Buddhas', as also reliquaries (stupas) of Gyeltsen Zangpo and Jetsun Chokyi Gyeltsen. However, as per reports, this college was destroyed and all resident monks also died in the bombardment done by the Chinese in 1959.