Declension table of ?tamasāvana

Neuter	Singular	Dual	Plural
Nominative	tamasāvanam	tamasāvane	tamasāvanāni
Vocative	tamasāvana	tamasāvane	tamasāvanāni
Accusative	tamasāvanam	tamasāvane	tamasāvanāni
Instrumental	tamasāvanena	tamasāvanābhyām	tamasāvanaiḥ
Dative	tamasāvanāya	tamasāvanābhyām	tamasāvanebhyaḥ
Ablative	tamasāvanāt	tamasāvanābhyām	tamasāvanebhyaḥ
Genitive	tamasāvanasya	tamasāvanayoḥ	tamasāvanānām
Locative	tamasāvane	tamasāvanayoḥ	tamasāvaneṣu

Compound tamasāvana -

Adverb -tamasāvanam -tamasāvanāt