The nonet is quite a fun poetic form.
Its only restraint is that on meter: decreasing syllables from nine to one, graduating along the nine lines, but other than that, rhyming is optional. So basically, the first line would have nine syllables, the second eight, up until the ninth and last which has only one syllable.
Tied to Fate
I fear that I cannot live restrained,
Bound to adhere to senseless rules—
A body I do not own;
Hands chained and tied to fate;
Mind frozen solid;
A heart unused—