Declension table of ?hṛnmantra

Masculine	Singular	Dual	Plural
Nominative	hṛnmantraḥ	hṛnmantrau	hṛnmantrāḥ
Vocative	hṛnmantra	hṛnmantrau	hṛnmantrāḥ
Accusative	hṛnmantram	hṛnmantrau	hṛnmantrān
Instrumental	hṛnmantreṇa	hṛnmantrābhyām	hṛnmantraiḥ hṛnmantrebhiḥ
Dative	hṛnmantrāya	hṛnmantrābhyām	hṛnmantrebhyaḥ
Ablative	hṛnmantrāt	hṛnmantrābhyām	hṛnmantrebhyaḥ
Genitive	hṛnmantrasya	hṛnmantrayoḥ	hṛnmantrāṇām
Locative	hṛnmantre	hṛnmantrayoḥ	hṛnmantreṣu

Compound hṛnmantra -

Adverb -hṛnmantram -hṛnmantrāt