Declension table of tamasvat

Masculine	Singular	Dual	Plural
Nominative	tamasvān	tamasvantau	tamasvantaḥ
Vocative	tamasvan	tamasvantau	tamasvantaḥ
Accusative	tamasvantam	tamasvantau	tamasvataḥ
Instrumental	tamasvatā	tamasvadbhyām	tamasvadbhiḥ
Dative	tamasvate	tamasvadbhyām	tamasvadbhyaḥ
Ablative	tamasvataḥ	tamasvadbhyām	tamasvadbhyaḥ
Genitive	tamasvataḥ	tamasvatoḥ	tamasvatām
Locative	tamasvati	tamasvatoḥ	tamasvatsu

Compound tamasvat -

Adverb -tamasvantam