Questions about the gameplay of Heroes 6.

1) What is the difference between the magic power from "Guardian of the Secret" and "Primal Magic"? 2) Does the magic power of "Primal Magic" contribute to the hero's overall magic power? 3) Why bother increasing magic power and spending valuable skill points on it? If magic power doesn't affect popular spells like "Stop Time," "Charm," "Dispel Magic," and many others. For example, "Charm" always lasts 1 turn, "Stop Time" lasts 2 turns, etc. 4) Perhaps it's enough to rely on the default magic power assigned by the game? Does magic power of 10 or 30 still result in "Charm" lasting only 1 turn? 5) And what does magic defense actually affect? What does it protect against?