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I don’t know about DM but adding an option for Regicide in Ranked Lobbies (same map pool as RM) can be good.
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Monks and Missionaries can garrision in Monasteries (when they are out).
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Horse Collar and further upgrades affect farms as multipliers like Horse Collar adds 43% (basically +75.25 on dark age farm) and also affects farms which have been built already.
I can understand why this was made for only newly built farms when the effect was additive.