In D1 we had different classes but all shared spells thx to the books that allow us to learn magic. With D2 and D3 the classes also got their own skills, which is great but there isn’t anything that prevent different classes to learn skills that arn’t their own.
Shared Skills
Since they will add tomes for D4 the idea is to create a different type of skills, the shared ones. This skills could introduce variations to our classes: they would become hybrid classes (multi-class).
It would be done by creating a separate branch of skills that can be used by all classes but can only be learn with books (tomes), and can’t spend skill points on them.
Examples
For example, if want to play a Barb with a shield but the Barb doesn’t have shield skills (maybe), they can equip a shield skill from the shared skill tab. If you want to play a Sorceress with a 2h sword, one could use a mele skill from the shared ones.
Skills
They could use unused spells from D1 and class skills they don’t plan to use from the existent classes. And new ones ofc.
D1 spells: ´https://diablo.gamepedia.com/Spells_(Diablo_I)´