Declension table of ?dṛḍhakṣatra

Masculine	Singular	Dual	Plural
Nominative	dṛḍhakṣatraḥ	dṛḍhakṣatrau	dṛḍhakṣatrāḥ
Vocative	dṛḍhakṣatra	dṛḍhakṣatrau	dṛḍhakṣatrāḥ
Accusative	dṛḍhakṣatram	dṛḍhakṣatrau	dṛḍhakṣatrān
Instrumental	dṛḍhakṣatreṇa	dṛḍhakṣatrābhyām	dṛḍhakṣatraiḥ dṛḍhakṣatrebhiḥ
Dative	dṛḍhakṣatrāya	dṛḍhakṣatrābhyām	dṛḍhakṣatrebhyaḥ
Ablative	dṛḍhakṣatrāt	dṛḍhakṣatrābhyām	dṛḍhakṣatrebhyaḥ
Genitive	dṛḍhakṣatrasya	dṛḍhakṣatrayoḥ	dṛḍhakṣatrāṇām
Locative	dṛḍhakṣatre	dṛḍhakṣatrayoḥ	dṛḍhakṣatreṣu

Compound dṛḍhakṣatra -

Adverb -dṛḍhakṣatram -dṛḍhakṣatrāt