The development of character abilities in Arcanum is heavily skill based. In common with the traditional D&D approach, we also have stats, but classes, per se, are completely absent. As your character gains experience you will have the option of increasing primary stats, secondary stats, basic skills, technological skills, and magical skills.
All of these categories will be available to you regardless of how you set up your character at the start or how you have already applied your experience. Previous decisions will impact how far you can advance particular skills and stats -- you can't achieve the degree of Engineer in any tech discipline without first becoming a Technician in that discipline. Further, there are no mutually exclusive skills.
You are perfectly free to build a character who is skilled in both necromancy and healing, or to study both tech and magic -- though in the latter example you can't be as good at either as a specialist. And of course, every one these stats and ... more.
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