Declension table of ?buddhamantra

Neuter	Singular	Dual	Plural
Nominative	buddhamantram	buddhamantre	buddhamantrāṇi
Vocative	buddhamantra	buddhamantre	buddhamantrāṇi
Accusative	buddhamantram	buddhamantre	buddhamantrāṇi
Instrumental	buddhamantreṇa	buddhamantrābhyām	buddhamantraiḥ
Dative	buddhamantrāya	buddhamantrābhyām	buddhamantrebhyaḥ
Ablative	buddhamantrāt	buddhamantrābhyām	buddhamantrebhyaḥ
Genitive	buddhamantrasya	buddhamantrayoḥ	buddhamantrāṇām
Locative	buddhamantre	buddhamantrayoḥ	buddhamantreṣu

Compound buddhamantra -

Adverb -buddhamantram -buddhamantrāt