Declension table of ?ṛktantra

Neuter	Singular	Dual	Plural
Nominative	ṛktantram	ṛktantre	ṛktantrāṇi
Vocative	ṛktantra	ṛktantre	ṛktantrāṇi
Accusative	ṛktantram	ṛktantre	ṛktantrāṇi
Instrumental	ṛktantreṇa	ṛktantrābhyām	ṛktantraiḥ
Dative	ṛktantrāya	ṛktantrābhyām	ṛktantrebhyaḥ
Ablative	ṛktantrāt	ṛktantrābhyām	ṛktantrebhyaḥ
Genitive	ṛktantrasya	ṛktantrayoḥ	ṛktantrāṇām
Locative	ṛktantre	ṛktantrayoḥ	ṛktantreṣu

Compound ṛktantra -

Adverb -ṛktantram -ṛktantrāt