Declension table of ?tapyatva

Neuter	Singular	Dual	Plural
Nominative	tapyatvam	tapyatve	tapyatvāni
Vocative	tapyatva	tapyatve	tapyatvāni
Accusative	tapyatvam	tapyatve	tapyatvāni
Instrumental	tapyatvena	tapyatvābhyām	tapyatvaiḥ
Dative	tapyatvāya	tapyatvābhyām	tapyatvebhyaḥ
Ablative	tapyatvāt	tapyatvābhyām	tapyatvebhyaḥ
Genitive	tapyatvasya	tapyatvayoḥ	tapyatvānām
Locative	tapyatve	tapyatvayoḥ	tapyatveṣu

Compound tapyatva -

Adverb -tapyatvam -tapyatvāt