Nityavibhūti — The Eternal Realm
Nityavibhūti (Sanskrit: nitya — eternal; vibhūti — glory/realm/wealth) is one of the two vibhūtis of Bhagavān in Viśiṣṭādvaita theology. The nityavibhūti is Śrī Vaikuṇṭham — the transcendent, non-material, eternal realm made of śuddha sattva (pure goodness), where Bhagavān is always present in his para form with Śrī Mahālakṣmī.
The other vibhūti is līlā vibhūti (the realm of divine play) — the material cosmos subject to time, birth, and death. Nityavibhūti is unaffected by the flux of prakṛti; it is a realm of perpetual bliss, knowledge, and kaiṅkarya.
Nitya-sūris (ever-free servants like Ādiśeṣa, Garuḍa, Viṣvaksēna) and muktas (liberated souls) dwell in nityavibhūti, engaged in unending, joyful service to Bhagavān. The prapanna's entire aspiration is to reach this realm and perform nitya-kaiṅkarya.