Declension table of ?varṣatantra

Neuter	Singular	Dual	Plural
Nominative	varṣatantram	varṣatantre	varṣatantrāṇi
Vocative	varṣatantra	varṣatantre	varṣatantrāṇi
Accusative	varṣatantram	varṣatantre	varṣatantrāṇi
Instrumental	varṣatantreṇa	varṣatantrābhyām	varṣatantraiḥ
Dative	varṣatantrāya	varṣatantrābhyām	varṣatantrebhyaḥ
Ablative	varṣatantrāt	varṣatantrābhyām	varṣatantrebhyaḥ
Genitive	varṣatantrasya	varṣatantrayoḥ	varṣatantrāṇām
Locative	varṣatantre	varṣatantrayoḥ	varṣatantreṣu

Compound varṣatantra -

Adverb -varṣatantram -varṣatantrāt