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I have two ideas that I think would be awesome to ramp up conflict in the game.
#1 - The red fog. I think it would be totally awesome if Grove users would be given the ability to "smudge out" the red fog like Necromancers exterminate the forests. The purpose of this effect should have some kind of mark on gameplay, like forests losing plant life or Grove users unable to utilize that once-part of the forest. (grove, flow, any forest ability). Perhaps introduce a small varied chance for fail of Necromantic abilities or loss of necro power regen or the cap lowered on how much they have while the fog is away. It could be their power source. Alternatively, we would obviously take damage standing in the red fog, but not any greater than forest defenses.. We could be enemied to it much like Oakstone's purpose. We could call this ability "renew" since the red fog is sort of desecration of the land.
#2 - It would be nice if being a member of Oakstone gave you the ability to rejuvenate forests, as the amount of Druid and Sylvan combatants is low and/or often snuffed out when Mhaldor is exterminating. This would give us more people to rejuvenate forests that are around. It would also give being a member of Oakstone a bit more usefulness than enemy tracking and calling out exterms.