Tips for playing Rift Daemons?

Personally I think that mixing up at least 2 of the havoc gods for daemons makes a lot of sense, especially when taking daemons of war (because they have no wizards). If you are planning to do a war list only then make sure to upgrade your heroes with fire whips and symbols of war to give them a little ranged power.

Plague is really cool albeit depending a bit more on luck of the dice since poison only works on rolls of 6 and regeneration only on rolls of 5+. Definitely try to take a level 2 wizard so you have a better chance at casting plague curse, because in combination with poison it allows you to potentially deal loads of damage.