Niru is 1 skill point short of what her level would suggest (and what any other dragon of the same level has) when she joins the party. Resetting skill points fixes this. The bug appears to be caused by data_heroes.xml giving her 1 point in the nonexistent passive skill “fire mouth”, which should be “epic halitosis” instead.
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… should be…
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You can see a similar issue with Princess-0 and all of the defenders in the Super Space Defenders mod, but that’s obviously less important. That one just comes from the default assigned skill points + unused skill points being less than their level.
This issue occurs in v1.1.33 of the game via Steam on Mac OS 10.8.