مَسَاجِدُ — مَسَاجِدَ — بِمَسَاجِدَ
دَوَابُّ — دَوَابَّ — بِدَوَابَّ
مَصَابِيحُ — مَصَابِيحَ — بِمَصَابِيحَ
For all three, nominative uses ḍamma, accusative uses fatḥa, and genitive (without al- or iḍāfa) uses fatḥa. Do not confuse genitive fatḥa with accusative case.
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Diptote Causes — Ultimate Broken-Plural Patterns
مَسَاجِدُ — مَسَاجِدَ — بِمَسَاجِدَ
دَوَابُّ — دَوَابَّ — بِدَوَابَّ
مَصَابِيحُ — مَصَابِيحَ — بِمَصَابِيحَ
For all three, nominative uses ḍamma, accusative uses fatḥa, and genitive (without al- or iḍāfa) uses fatḥa. Do not confuse genitive fatḥa with accusative case.