Declension table of ?nityātantra

Neuter	Singular	Dual	Plural
Nominative	nityātantram	nityātantre	nityātantrāṇi
Vocative	nityātantra	nityātantre	nityātantrāṇi
Accusative	nityātantram	nityātantre	nityātantrāṇi
Instrumental	nityātantreṇa	nityātantrābhyām	nityātantraiḥ
Dative	nityātantrāya	nityātantrābhyām	nityātantrebhyaḥ
Ablative	nityātantrāt	nityātantrābhyām	nityātantrebhyaḥ
Genitive	nityātantrasya	nityātantrayoḥ	nityātantrāṇām
Locative	nityātantre	nityātantrayoḥ	nityātantreṣu

Compound nityātantra -

Adverb -nityātantram -nityātantrāt