Declension table of mantrayāna

Neuter	Singular	Dual	Plural
Nominative	mantrayānam	mantrayāne	mantrayānāni
Vocative	mantrayāna	mantrayāne	mantrayānāni
Accusative	mantrayānam	mantrayāne	mantrayānāni
Instrumental	mantrayānena	mantrayānābhyām	mantrayānaiḥ
Dative	mantrayānāya	mantrayānābhyām	mantrayānebhyaḥ
Ablative	mantrayānāt	mantrayānābhyām	mantrayānebhyaḥ
Genitive	mantrayānasya	mantrayānayoḥ	mantrayānānām
Locative	mantrayāne	mantrayānayoḥ	mantrayāneṣu

Compound mantrayāna -

Adverb -mantrayānam -mantrayānāt