Declension table of ?drvanna

Neuter	Singular	Dual	Plural
Nominative	drvannam	drvanne	drvannāni
Vocative	drvanna	drvanne	drvannāni
Accusative	drvannam	drvanne	drvannāni
Instrumental	drvannena	drvannābhyām	drvannaiḥ
Dative	drvannāya	drvannābhyām	drvannebhyaḥ
Ablative	drvannāt	drvannābhyām	drvannebhyaḥ
Genitive	drvannasya	drvannayoḥ	drvannānām
Locative	drvanne	drvannayoḥ	drvanneṣu

Compound drvanna -

Adverb -drvannam -drvannāt