Declension table of ?kṛṣṇaja

Masculine	Singular	Dual	Plural
Nominative	kṛṣṇajaḥ	kṛṣṇajau	kṛṣṇajāḥ
Vocative	kṛṣṇaja	kṛṣṇajau	kṛṣṇajāḥ
Accusative	kṛṣṇajam	kṛṣṇajau	kṛṣṇajān
Instrumental	kṛṣṇajena	kṛṣṇajābhyām	kṛṣṇajaiḥ kṛṣṇajebhiḥ
Dative	kṛṣṇajāya	kṛṣṇajābhyām	kṛṣṇajebhyaḥ
Ablative	kṛṣṇajāt	kṛṣṇajābhyām	kṛṣṇajebhyaḥ
Genitive	kṛṣṇajasya	kṛṣṇajayoḥ	kṛṣṇajānām
Locative	kṛṣṇaje	kṛṣṇajayoḥ	kṛṣṇajeṣu

Compound kṛṣṇaja -

Adverb -kṛṣṇajam -kṛṣṇajāt