I my local group we have been using the rules for the Realm of Life, setting a campaign there, but many people are forgetting some of them. Mainly been using the triumphs, and the battleshock roll of 1 rule. People forget all the Nurgle benefits, the extra spell, and if using the version from Quest for Ghal Maraz that they can possibly summong Sylvaneth. Also, I have just become aware that there are global Time of War rules, such as the Overthrow the Tyrant, and since I have some Stormcasts I could benefit from.