The Clan Totems

Clan Totems allow a clan to mark the borders of their lands. They are only available to players with Clan Halls (which means paying players). Clan with no Hall are nomadic anyway and so have no borders needing marking.

The details

And that's that. Basically the Totems are used to stop accidental incursion by unknown clans. They in no way deter an enemy who will simply destroy them.