Ill edit my post in a few minutes and tell you.
Still in waitinglist and i dont know the name of the items.
But basicly its like this: You buy the (i call it Exctract powder for now).
With this Extract powder (costs about 1000gold) you can "destroy" other items.
The item will be destroyed and you will get a - lets call it - upgrade core.
With this upgrade core you can + your items.
The quality of the upgrade core depens on the lvl of the item.
This means: if u destroy a lower lvl item, you'll get a low quality upgrade core.
Useing this low quality upgrade core on a higher lvl item is just a bad idea because it has a higher failing rate.
I'll add some screens where to buy the Extract poweder when i'm ingame.
Edit: Costs 1246. Screen atteched. It's in the asmodien city.