Declension table of ?śyāmāmantra

Masculine	Singular	Dual	Plural
Nominative	śyāmāmantraḥ	śyāmāmantrau	śyāmāmantrāḥ
Vocative	śyāmāmantra	śyāmāmantrau	śyāmāmantrāḥ
Accusative	śyāmāmantram	śyāmāmantrau	śyāmāmantrān
Instrumental	śyāmāmantreṇa	śyāmāmantrābhyām	śyāmāmantraiḥ śyāmāmantrebhiḥ
Dative	śyāmāmantrāya	śyāmāmantrābhyām	śyāmāmantrebhyaḥ
Ablative	śyāmāmantrāt	śyāmāmantrābhyām	śyāmāmantrebhyaḥ
Genitive	śyāmāmantrasya	śyāmāmantrayoḥ	śyāmāmantrāṇām
Locative	śyāmāmantre	śyāmāmantrayoḥ	śyāmāmantreṣu

Compound śyāmāmantra -

Adverb -śyāmāmantram -śyāmāmantrāt