Declension table of ?sūryamantra

Masculine	Singular	Dual	Plural
Nominative	sūryamantraḥ	sūryamantrau	sūryamantrāḥ
Vocative	sūryamantra	sūryamantrau	sūryamantrāḥ
Accusative	sūryamantram	sūryamantrau	sūryamantrān
Instrumental	sūryamantreṇa	sūryamantrābhyām	sūryamantraiḥ sūryamantrebhiḥ
Dative	sūryamantrāya	sūryamantrābhyām	sūryamantrebhyaḥ
Ablative	sūryamantrāt	sūryamantrābhyām	sūryamantrebhyaḥ
Genitive	sūryamantrasya	sūryamantrayoḥ	sūryamantrāṇām
Locative	sūryamantre	sūryamantrayoḥ	sūryamantreṣu

Compound sūryamantra -

Adverb -sūryamantram -sūryamantrāt