HoMM VII Haven Units – Haven faction units from the seventh installment of Heroes of Might and Magic.

By the way, could you share the import/export plugins, or are they already available somewhere publicly, and I just missed them?

I think the plugin for importing gr2 files (skeleton, not sure about animations) should be enough for creating animations. https://neverwintervault.org/project/nwn2/other/3ds-max-mdb-importerexporter