is a homegrown ruleset for using the 'very' classic elemental miniatures from GW. They were created during the last installment of the rules, but I think they will still work just fine.
In the end I borrowed a large part of the rules from other creatures used in Warhammer. 'Magical Instability' for instance is based on the rules for Demonic Instability, with the ties to the wizard as a little extra. I kept playtesting and making little changes for a couple of months. The trickiest part was figuring out what the most appropriate Cost for the Unit would be. Of course my opponents claimed that it was so effective, scary and destructive it should be more expensive.
In the end it turned out to be quite balanced, with a really specific purpose during a game.