The consonants for Barbaric are:
Nasals: m, n, ng
Stops: b, d, g
Fricatives: v /v~ʋ/, dd /ð/, z, x /ɣ/
Approximants: w, l, j
Trills: r, rr /ʀ/
The vowels for Barbaric are:
Short: i /ɪ/, e /ɛ/, a /a~ɑ/, u /ʊ~ɔ/
Long: ii /i:/, ee /ɛ:/, aa /ɑ:/, uu /u:/
Dipthongs: iu, ei /ɛi/, ai /ɑi/, au /ɑʊ/, ui
The General formula is (C)CV(C)(C)
However, the internal Consonants must be of lower sonority than the external consonants.
The Heirarchy is: [w, l, j] > [v, dd, z, x] > [r, rr] > [m, n, ng] > [b, d, g]
Such that 'bwand' is allowed, but *wband or *bwadn is not.
There are, however, many exceptions to these guidelines.