Declension table of ?siddhamantra

Masculine	Singular	Dual	Plural
Nominative	siddhamantraḥ	siddhamantrau	siddhamantrāḥ
Vocative	siddhamantra	siddhamantrau	siddhamantrāḥ
Accusative	siddhamantram	siddhamantrau	siddhamantrān
Instrumental	siddhamantreṇa	siddhamantrābhyām	siddhamantraiḥ siddhamantrebhiḥ
Dative	siddhamantrāya	siddhamantrābhyām	siddhamantrebhyaḥ
Ablative	siddhamantrāt	siddhamantrābhyām	siddhamantrebhyaḥ
Genitive	siddhamantrasya	siddhamantrayoḥ	siddhamantrāṇām
Locative	siddhamantre	siddhamantrayoḥ	siddhamantreṣu

Compound siddhamantra -

Adverb -siddhamantram -siddhamantrāt