Larian Studios Forums Divinity - Original Sin Divinity - Original Sin - General Items that cannot be upgraded in Divinity: OS

tx3000:
Did you read all the recipe books in the game? Because you can find answers in them for these problems.

For example:
Weapon damage upgrade for staffs - add moonstone to the staff (need at least 3 or 4 level on the crafting skill), the first or the second blacksmithing book tell this or the adventurer's guide book.

Shield upgrade - currently inactive (one of the recipe books said you can combine them with metal, you can also use the shields on an anvil, but you must have a high blacksmithing skill)

Armor boost for leather armor types - use them on a mobile kitchen (combine the two), combine them with cup of oil to lower the movement penalty (this works with all armor except cloth types), and IIRC they can be combined with metal fragments/scraps for extra defense (if you combine a leather armor with scales, you can make a scale armor), and finally, you can use them on an anvil (not all of them but some)

Rings/amulets/other things (helmets, belts, bracers and so on) - can be combined with elemental essences for additional resistance, some parts can be combined with ruby

For cloth armor upgrade... I don't know. Never used them, so I don't care.

Some other items (like tormented souls, bow strings, telescope, magical animal parts) can be combined with specific items for additional effects (like extra Str and Dex or extra damage or extra Perception).