Board Thread:Skyrim/@comment-11441888-20130711011114/@comment-72.207.106.184-20130730221727

Lord Hadron wrote: 72.207.106.184 wrote: Dragon priests aren't that hard to kill, even on master, provided that you prepare for the encounter. As a mage, you'll want impact which basically lets you and your followers chain attacks relentlessly. As a warrior, it'll be rather difficult because they just float away from you. As a sneak, utilize invisibility (if no illusion or potions, just go bow). Dragon Priests cannot really heal themselves (if they can I haven't seen them do it), so just find cover and heal up/ let magicka flow in. When outside, I like to spam clear skies because one word will stagger the dude with only a 5 second recharge. Firstly, Clear Skies only works outdoors. Indoors, it has no effect. And while only 3 dragon priests make an appearance outside, i'd say that last tip isn't really worth taking into consideration.

Plus, illusion spells don't work on Dragon priests, they're either too high of a level and are undead to be affected by Illusion spells, and being the floating corpses that they are, they are immune to illusion-based poisons. E.g Frenzy Poison.

It already states that clear skies doesn't always work. And yes, illusion doesn't always work (mostly depends on level/ potency).