I understand what you're saying Rathan, but as far as artifacts on which sacrifices have been spent, if you can't lose the artifact you aren't sacrificing anything for it, you get more back than the sacrifice is worth, we may as well just add that extra power to the paths, there's no point having artifacts (with sacrifices) seperate if everyone WILL have one, thats not the point, my expectation is this: everyone will have an artifact, some people will sacrifice something for it, those who sacrifice something get a stronger artifact but risk falling below their normal level if they lose it (otherwise everyone will sacrifice because there's no ACTUAL price to it and thats just silly (not everyone can destroy a location or forget a sig style, suffer from the curse of ill health etc)). If you lose a non-sacrificed artifact its not such a big deal, you can make another one etc, oh and no someone who takes an artifact cannot destroy it, so you always have a possibility of getting it back (thinking about some kind of system where you can't refuse a challenge with someone who's artifact you've stolen without having to give it back (to prevent a lucky tier 2 nicking of with a Tier 5, Mortal Sacrifice artifact, refusing to fight anyone higher tier ever again and destroying his peers).
Actually you can lose an artifact if you're defeated in a battle in which you use it at the moment, but Sollir and I are arguing about that so it may change to something more restrictive.