The Fourth Divine Emanation
Aniruddha ('unobstructed' or 'he who cannot be impeded') is the fourth of the four Vyūhas, emanating from Pradyumna. In Pañcarātra cosmology, Aniruddha is associated with ahaṅkāra (the principle of individual selfhood and ego-differentiation) and with the most manifest level of creation — the world as it appears to embodied beings.
Divine Qualities
Aniruddha manifests two of the six divine qualities: śakti (creative potency, now in its fully manifested form) and tejas (the radiance that makes creation visible and real). At the Aniruddha level, creation has fully differentiated: the individual jīvas are distinct, bodies are distinct, the material world is manifest and operative.
Connection to the World
Aniruddha is the Vyūha who is most directly concerned with the world — He oversees and participates in the operations of individual karma, the management of created beings, and the sustaining of the material universe in its functioning. He is, in a sense, the divine presence closest to embodied experience.
The Antaryāmin Bridge
Aniruddha is the Vyūha level that bridges to the Antaryāmin (inner controller) mode: from managing creation at the cosmic level (Aniruddha) to dwelling within each individual being as the inner self (Antaryāmin). This makes Aniruddha the Vyūha most relevant to understanding how the Lord is present in saṃsāric experience.