Mana stealing mobs -.-

why are there now almost always 1-3 of these blue mana ring mobs in maps now its an extremely frustrating mechanic with not much at all way to counter it.

i literally have to run off screen (assuming its not hasted too) and make them lose agression so i can regen mana to throw traps off the edge of my screen, like what sorta gameplay is that -.- ?

big F of a mechanic, take it out. dont even rebalance it just press delete.