Warzone 1: Earth protection + Keep dwarven rings always on, and once you reach the final room, stack to the east and mwall in front, so you will be safe from the creatures respawning
Warzone 2: Fire protection, do not kill infected weepers, since they are key to entering the boss room
Warzone 3: They hit very hard and make you drunk, keep dwarven ring on and don't tank the creatures, once reaching final room, stack behind magic wall, so you can avoid the Minions of Vesperoth that will constantly respawn, they hit very hard.
https://www.youtube.com/watch?v=OSMH8rhPc5o
This video shows where to MWALL in Warzone 1 and Warzone 3 :)