Schmere wrote:
Everything that can normally be dispelled - judgments, DoT's (other than UA), polymorph, roots, hybernate, seduction and other random magic effects cast by mobs and/or players.
Removes Ice Block, Divine Shield and Protection, Banish.
I'm sure I missed a few but those are the most common ones. There are really only a few undispellable player magic effects. These are the ones that can be dispelled by mass dispel.
Just to add and adjust, by using Mass Dispel:
Judgements can be dispelled, but seals, with enough talents in the Retribution tree, can be made undispellable.
Unstable Affliction can be dispelled; it's simply a bad idea to do so (usually).
Ice Block, Divine Shield, and Blessing of Protection all have a % chance to be dispelled, and have priority targeting by Mass Dispel.
A warlock's Banish and a druid's Cyclone cannot be dispelled. Don't even try. Only PvP trinkets remove it (not even Ice Block or Divine Shield).
Pain Suppression and Cloak of Shadows both provide significant dispel resistance, but do not have priority targeting from Mass Dispel, and do not outright prevent dispelling.