An interesting idea floated around in our group discussion last night. So here's the thought.
You can combine ONE class skill line with ONE other class skill line to form a hybrid class. You would have two class skill lines as opposed to three.
Your purebred, original classes would still have a third skill line, so this would only affect those that would decide to create a hybrid.
Can you imagine the combinations? Players would be totally unpredictable and would add a whole new dimension for PVP. What two class skill lines would you combine? What problems would this create?
Personally, I'd go with...Siphoning (NB) and Daedric Summoning (Sorc). Curses, Shields, Swallow Soul, Soul Tether, Cloak, Fear, and shade. Lmao. Just for fun guys.