A supportive board for writers at all levels to discuss writing topics, debate burning issues related to publishing, To publicise your novel. And to seek support of every kind in helping you to become a better writer.
Chapter titles are always optional. In a series like Song of Ice and Fire it helps because you know which character you are focusing on (as their name is the title of the chapter.) But I will say Fantasy is the one genre where you can go crazy with chapter titles and no one will bat an eye. You can emphasize a plot point, or just highlight how cool some name is, or really play with the mood - like Neil Gaiman when he does fantasy will sometime do something like Chapter 3: In which Titanius travels abroad and a great secret is unearthed. So if the idea appeals to you, go for it. If it doesn't just number them and be done with it.
I've found them helpful during my revisions process. I take out chapters that aren't working and add a few to kick the tension up a notch. This has required renumbering my chapters repeatedly and I've lost a few files temporarily. A copy of chapter twelve might change it's number but it's title stays the same and makes it easier to identify.
I think chapter titles are important in fantasy 'cause it helps the reader understand what's to come. But I also believe that not having a title in the chapter is also not necessary, it helps to have a bit of mystery.