Student or Learner
If the vital force, i.e. Prajna (the soul in a state of deep sleep) of which the vital force is an Upadhi is true or real, Brahman is the Truth or Reality of this real.
(Brahma Sutras; According to Sri Sankara by Swami Vireswarananda)
Have I understood the part in bold correctly:
An Upadhi is the vital force of the vital force called Prajna.