Eleven things I will serve my best never to put in a fantasy novel unless I am trying to undermine them, and in fact could do without entirely from now on, thanks1. The word "orb." Unless we're talking about
orb-weaver spiders, in which case, rock on.
2. Beauty correlating with goodness.
3. Quests.
4. Protagonists who are protagonists by virtue of being Special,
particularly if their Specialness correlates with #2.
5. Telepathic companion animals.
6. Young women who live in a cod-medieval society and yet, somehow, are athletic, assertive, bad at sewing, and generally dressed in trousers. See also #4.
7. Social predators (thieves, assassins, etc.) with whom the reader is supposed to sympathize.
Particularly if we're supposed to sympathize because of #4.
8. EEEEEEEEEEEEEEEEEEEVIL.
9. Heteronormativity. Likewise sexism, Default Fantasy Caucasianism, and the unquestioned assumption of middle-class values.
10. What Edward Gorey called P.R.O.s (Priceless Ritual Objects). See also #1, #3.
11. Saving The World. See also #8.
Or talking spaceships, those work too...