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A guild decided to sunk a node. That node needs a ton of mats to prepare proper defenses. They need rocks and trees in huge amounts. The guild prepares everything for the siege scroll, then makes the minimum lvl alts to go farm out every tree and rock in that node, so that they don't respawn for some time. Depending on the size of the node and the guild, this might take one evening.
The guild then uses the scroll and now the node citizens have to go to other nodes to get all of those resources. But all the others nodes are not interested in destroying their own ecosystems so they block the intruders to the best of their ability.
If that original node has allied nodes - the guild can just go farm out their lands too. Because again, for a big enough guild that's not a problem at all. I dunno if you've played on mid-high rate private servers of L2, but even on those more relaxed servers I managed to make my guildies make several alts for several bosses and then use them to farm said bosses. This was in semi-casual guilds of big size too. And, in theory, AoC's guilds wouldn't even need to level up those alts, because "you see a tree - you chop a tree".
And so after all of that, you have yourself an unprotected node about to get sieged by a big guild (which might also have allies). And that node couldn't really do anything about it, because PKing dozens of lvl1s would put them so fucking deep in XP debt that their chars would no longer exist.
There's a chance that the victim node might try buying all the required mats in other nodes and tries to transfer them, which will then lead to the attacking guild raiding those caravans and benefiting even more from the whole situation.
Imo that sounds like shitty design with 0 risk for a ton of reward, while also bordering on bullying the victim (though that's highly debatable).