Declension table of ?mantrayiṣyat

Masculine	Singular	Dual	Plural
Nominative	mantrayiṣyan	mantrayiṣyantau	mantrayiṣyantaḥ
Vocative	mantrayiṣyan	mantrayiṣyantau	mantrayiṣyantaḥ
Accusative	mantrayiṣyantam	mantrayiṣyantau	mantrayiṣyataḥ
Instrumental	mantrayiṣyatā	mantrayiṣyadbhyām	mantrayiṣyadbhiḥ
Dative	mantrayiṣyate	mantrayiṣyadbhyām	mantrayiṣyadbhyaḥ
Ablative	mantrayiṣyataḥ	mantrayiṣyadbhyām	mantrayiṣyadbhyaḥ
Genitive	mantrayiṣyataḥ	mantrayiṣyatoḥ	mantrayiṣyatām
Locative	mantrayiṣyati	mantrayiṣyatoḥ	mantrayiṣyatsu

Compound mantrayiṣyat -

Adverb -mantrayiṣyantam