Enhanced 1 works like original 2, with the same rules. You can't have 2 rings of wizardry stack their effect. But you can have 1 wizardry and 1 acuity. Also, Enhanced Editions balanced and fixed a plethora of things, so i recommend you playing 1EE like playing original 2, with this mindset.
The spell you mention is wraithform. In originals, only Edwin can have it in spellbook. In enhanced, you get it during the arena but if you export your character, you keep it for later use, too.
I seriously recommend you to stay off the Enhanced Edition, though. First they put the originals as "extras" next to them, removing them from the store. Second, you have to pay double price to get the package, even if you are only interested in originals themselves. And last but not least, EEs have many issues, most of them having to do with bugs, game stability, etc.
Post edited August 07, 2016 by KiNgBrAdLeY7