Declension table of ?ṛchivas

Neuter	Singular	Dual	Plural
Nominative	ṛchivat	ṛchuṣī	ṛchivāṃsi
Vocative	ṛchivat	ṛchuṣī	ṛchivāṃsi
Accusative	ṛchivat	ṛchuṣī	ṛchivāṃsi
Instrumental	ṛchuṣā	ṛchivadbhyām	ṛchivadbhiḥ
Dative	ṛchuṣe	ṛchivadbhyām	ṛchivadbhyaḥ
Ablative	ṛchuṣaḥ	ṛchivadbhyām	ṛchivadbhyaḥ
Genitive	ṛchuṣaḥ	ṛchuṣoḥ	ṛchuṣām
Locative	ṛchuṣi	ṛchuṣoḥ	ṛchivatsu

Compound ṛchivat -

Adverb -ṛchivas