Vibhūti Yoga · Verse 28
आयुधानामहं वज्रं धेनूनामस्मि कामधुक् | प्रजनश्च कन्दर्पः सर्पाणामस्मि वासुकिः
āyudhānām ahaṃ vajraṃ dhenūnām asmi kāma-dhuk | prajanaś ca kandarpaḥ sarpāṇām asmi vāsukiḥ
Of weapons I am the thunderbolt; of cows I am the wish-fulfilling Surabhi; of progenitors I am Cupid, and of serpents I am Vāsuki.
Āyudhānām — of weapons — vajram — Indra’s thunderbolt, indestructible. Dhenūnām — of cows — kāma-dhuk — the celestial cow Surabhi, who grants wishes.
Prajanaḥ — those who procreate — kandarpaḥ — Kāmadeva, god of love. Sarpāṇām — of serpents — vāsukiḥ — king of the nāgas, used as rope in the churning of the ocean.
The vibhūti is the source of the power or function of the category.