Difference between Curse and Illness?

[Triumph]

Would fighter's stun and mages fear be considered curse? So would an increase in cure resistance would lower the chance of getting stunned or feared?

As far as I have noticed, yes, Stun and Fear are both curses. Whereas Fear has a 100% success rate as of now, be it a bug or not, Fighter stuns will register as a curse. Having Legendary/Heavenly Necklaces will cause a noticeable decrease in the number of times you get stunned, but it won't be a significant difference.