When Two worlds first came out was there the option of runes or crystals that could be installed in your sword like Diablo? Anyway I stopped playing till this year and It seems like It was patched to the "Moon" compared to the initial release. Now I find It fun and thank GOG for making It available.

I'm not sure... the GOG release includes crystals you can find that will add elemental damage to weapons. You can keep adding these to add more and more elemental damage, but you can only do one type of elemental damage per weapon. They don't show up in "slots" the way they do in Diablo though, they just add an elemental damage enchantment to the weapon and then the crystals are used up. I found that these crystals were quite common, such that it was always worth enchanting whatever weapon you're using at the time. You can also make them using alchemy.