Wizard balancing

[mralexs]

So after a recent round where 4 wizards worked together a forced a shuttle call rather early, Wizards need some balancing. Some spells need to be locked out if you choose others, IE spell shield and forcewall. Wizard rounds should also be limited to 3 wizards, as 4-5 is impossible for sec to deal with if they're sticking together and working together as well.