purge spell mechanic

[liljc711]

Sometimes when I use purge it immediately removes BOP or another purgeable defensive. Other times it feels like I have to remove every buff imaginable before the defensive gets removed. Is there a set rule/ piority type list of what the in game mechanics are to purging. With mana intensive as the game feels currently, there are times I want to purge, but if I can quickly look at his other buffs and know that the spell I’m wanting to get purged is a low priority in game mechanic function, then I don’t have to waste global/ mana.

[Kralljin]

As far as i know, there is no rule set, it's random.

Which used to be a huge pain back when you even just dispelled a single magic debuff on targets, there was a massive difference betwen dispelling Frost Nova and Frost bolt slow first.