They are making two brand new skills - mysticism and embuing. Interesting idea on just switching out but I don't think they are doing that.
you can embue anything that is made of regular materials (iron, plain leather..plain wood)
You can unravel anything following the same basic materials!
There is a pretty good write up on styg site now but basically...
You cannot remove one prop from an item and save it for anther item like many think. Unraveling is total destruction of a weapon at this point.
The value of the weap is based ona point scale. weps that have 400points or more will give you a relic. The relic is a powerful piece that allows you to embue a skill onto a plain leather, iron, wood piece.
How do u get 400 point pieces... well that is measured by intensity. a 400 piece is a piece that has four, yes four max properties on it or 5 properties averaging 80% intensity each.
If it is less than that you get magical dust or one other thing but the relic piece is what you really want.
I am under the understanding that you can choose what to embue onto your piece with the relic but it requires ingrediants that will include peerless ingrediants, gems, amber etc. All the worthless items that need a use may become ingrediants. Your item will not be destroyed if you fail but you will have a chance of losing ingrediants.
I think that gives you a round about idea. oh yeah you can fill an bag- like a salvage bag and embue a whole bag in one shot too! not sure how that will work for gains but it will be easy.