- any person can activate border cairn
- inactive cairn do not drains authority but still expands formal domain around; no authority collected, no bonus provided
- activation does not require any additional costs, just a brief attention of any character
That way realm inhabitants can somewhat deal with uncooperative/unsupportive realms, and at the same time the realm holders can assert their influence on areas of particular interest despite opinion of local population:
- if realm holders wish to receive their taxes, they send a "tax collector" to activate the clairn (yeah, a naked alt, of course)
- if local population wish to receive the realm bonus, they send their "representative" to activate the cairn
- if no one cares about the cairn, it goes inactive
- if the local population wishes to be free, they can try to block access to the cairn
- if realm holders wish to be sure that cairn will continue to work, they make additional effort to secure that cairn, at the cost of random access to it
- that way realm holders will be forced to establish some relations with local population, to save the effort and to be sure that locals will take care of the cairn without additional attention from the capital
Also, that way the game can have Shire-like situations: "This land always was a part of Arnor." - "What Arnor?"
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On a related topic: what is the logic behind current cairn maintenance costs? 10 authority/day looks like 0 auth/day: one passing sprucecap with a hearthfire outside the realm can fuel the cairn for a week. If there is no some unobvious reasons behind this, I feel the 5x maintenance cost will still be cheap enough for vast expansion.