Declension table of ?kṛṣṇātreya

Masculine	Singular	Dual	Plural
Nominative	kṛṣṇātreyaḥ	kṛṣṇātreyau	kṛṣṇātreyāḥ
Vocative	kṛṣṇātreya	kṛṣṇātreyau	kṛṣṇātreyāḥ
Accusative	kṛṣṇātreyam	kṛṣṇātreyau	kṛṣṇātreyān
Instrumental	kṛṣṇātreyeṇa	kṛṣṇātreyābhyām	kṛṣṇātreyaiḥ kṛṣṇātreyebhiḥ
Dative	kṛṣṇātreyāya	kṛṣṇātreyābhyām	kṛṣṇātreyebhyaḥ
Ablative	kṛṣṇātreyāt	kṛṣṇātreyābhyām	kṛṣṇātreyebhyaḥ
Genitive	kṛṣṇātreyasya	kṛṣṇātreyayoḥ	kṛṣṇātreyāṇām
Locative	kṛṣṇātreye	kṛṣṇātreyayoḥ	kṛṣṇātreyeṣu

Compound kṛṣṇātreya -

Adverb -kṛṣṇātreyam -kṛṣṇātreyāt