I have not meet a mob in the game that I am scared off, that I can resist 50% of the time.
From hours of meriting @ pudding camps I have never noticed them get resisted while casting on me. Sure they don't do big numbers, but that's because I have ~20INT more than them. And they are a lvl77-80... not an HNM.
If you are get agro from a Haunt while skilling up in the Kuftal Tunnel then sure, equip an INT ring and laugh as they get resisted, but it only works when the level correction is in your favour.