Declension table of ?ṛkṣamantra

Masculine	Singular	Dual	Plural
Nominative	ṛkṣamantraḥ	ṛkṣamantrau	ṛkṣamantrāḥ
Vocative	ṛkṣamantra	ṛkṣamantrau	ṛkṣamantrāḥ
Accusative	ṛkṣamantram	ṛkṣamantrau	ṛkṣamantrān
Instrumental	ṛkṣamantreṇa	ṛkṣamantrābhyām	ṛkṣamantraiḥ ṛkṣamantrebhiḥ
Dative	ṛkṣamantrāya	ṛkṣamantrābhyām	ṛkṣamantrebhyaḥ
Ablative	ṛkṣamantrāt	ṛkṣamantrābhyām	ṛkṣamantrebhyaḥ
Genitive	ṛkṣamantrasya	ṛkṣamantrayoḥ	ṛkṣamantrāṇām
Locative	ṛkṣamantre	ṛkṣamantrayoḥ	ṛkṣamantreṣu

Compound ṛkṣamantra -

Adverb -ṛkṣamantram -ṛkṣamantrāt