Declension table of ?himadhvasta

Neuter	Singular	Dual	Plural
Nominative	himadhvastam	himadhvaste	himadhvastāni
Vocative	himadhvasta	himadhvaste	himadhvastāni
Accusative	himadhvastam	himadhvaste	himadhvastāni
Instrumental	himadhvastena	himadhvastābhyām	himadhvastaiḥ
Dative	himadhvastāya	himadhvastābhyām	himadhvastebhyaḥ
Ablative	himadhvastāt	himadhvastābhyām	himadhvastebhyaḥ
Genitive	himadhvastasya	himadhvastayoḥ	himadhvastānām
Locative	himadhvaste	himadhvastayoḥ	himadhvasteṣu

Compound himadhvasta -

Adverb -himadhvastam -himadhvastāt