Declension table of aṣṭādaśākṣaramantra

Neuter	Singular	Dual	Plural
Nominative	aṣṭādaśākṣaramantram	aṣṭādaśākṣaramantre	aṣṭādaśākṣaramantrāṇi
Vocative	aṣṭādaśākṣaramantra	aṣṭādaśākṣaramantre	aṣṭādaśākṣaramantrāṇi
Accusative	aṣṭādaśākṣaramantram	aṣṭādaśākṣaramantre	aṣṭādaśākṣaramantrāṇi
Instrumental	aṣṭādaśākṣaramantreṇa	aṣṭādaśākṣaramantrābhyām	aṣṭādaśākṣaramantraiḥ
Dative	aṣṭādaśākṣaramantrāya	aṣṭādaśākṣaramantrābhyām	aṣṭādaśākṣaramantrebhyaḥ
Ablative	aṣṭādaśākṣaramantrāt	aṣṭādaśākṣaramantrābhyām	aṣṭādaśākṣaramantrebhyaḥ
Genitive	aṣṭādaśākṣaramantrasya	aṣṭādaśākṣaramantrayoḥ	aṣṭādaśākṣaramantrāṇām
Locative	aṣṭādaśākṣaramantre	aṣṭādaśākṣaramantrayoḥ	aṣṭādaśākṣaramantreṣu

Compound aṣṭādaśākṣaramantra -

Adverb -aṣṭādaśākṣaramantram -aṣṭādaśākṣaramantrāt