Make Gathering Griefers Auto-Flag

I'd agree with Strevi's suggestion of reputation based mechanics and they could maybe tie into the Enemy of the State mechanic or Node War one. Maybe make it easier to declare both/either of those things if players of your node catch an "intruder" overfarming your stuff. And players should have a streamlined way to indicate such intruders to their mayor.

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Doesn't take much organization to tell your big guild to "just go cut down trees in this node so that they can't make defenses for the siege" and then repeat the same thing to your nodemates so that the situation couldn't be resolved with a guild war.

PKing dozens if not hundreds of people over and over and over again seems like character suicide rather than a logical solution to the attack on the node.

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Which is exactly why I think that node reputation linked with node wars and Enemy of the State mechanics would be a good solution. Those systems are already in place and you just need to make the combination process a bit more streamlined than it might already be and you have yourself a great way to counter an aggressive gathering action.

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I can definitely see how this system will be one of the main PK baits in the game, if there's no other way to counter aggressive gatherers.