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There might be a more general place for this, but these artifacts being changed: will their owners receive a full refund of costs paid? Ie. Credits paid for the charm/socks, full wonder crystal return on brazier? I've seen it in other ire games when an artifact is changed in a significant way, just wondering if the same standard will be held. Probably easier to get people to swallow the changes as well.
I thought 3s was too short. Similarly I think 30s is too long. Still, the delayed activation is the solution I prefer and it should be pretty easy to change the number around a bit if needed in the future. And who knows, maybe 30s will be fine, no way to really tell without trying it I suppose.