Was thinking about filling the gap between the Wooden Idol and the Nordic Temple, without having to build christian chapels. Maybe a Runestone? It would need a boulder and a looot of (carving) work, and would work as pre-7.1 Wooden Idol (boosting happiness besides being an idling location). To balance it, there could be a limit of them (there aren’t that many runestones after all) and only a small radius of its effect.
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