Declension table of ?satyamantra

Masculine	Singular	Dual	Plural
Nominative	satyamantraḥ	satyamantrau	satyamantrāḥ
Vocative	satyamantra	satyamantrau	satyamantrāḥ
Accusative	satyamantram	satyamantrau	satyamantrān
Instrumental	satyamantreṇa	satyamantrābhyām	satyamantraiḥ satyamantrebhiḥ
Dative	satyamantrāya	satyamantrābhyām	satyamantrebhyaḥ
Ablative	satyamantrāt	satyamantrābhyām	satyamantrebhyaḥ
Genitive	satyamantrasya	satyamantrayoḥ	satyamantrāṇām
Locative	satyamantre	satyamantrayoḥ	satyamantreṣu

Compound satyamantra -

Adverb -satyamantram -satyamantrāt