Discussion of the Academy faction (Mages and Wizards). Tactics and their specific features.

I have a question about minor artifacts: what is the maximum percentage of magic resistance that can be added to a mage unit? If it's 100%, does that mean it's like immunity – magic won't deal damage, or does it work differently? And if resistance is added to golems, how exactly are the values of natural resistance and the one from the artifact combined? And another question related to the previous one: let's say golems manage to get 140% magic resistance – how will the warlock's ability affect it if he has 50% magic penetration?