Just went through the search function and thought this is the most appropriate existing thread to ask some questions:
What is the technical difference between amplifying magic damage and reducing magic resistance?
How does that apply to non-hero units? I guess they can take more magic damage under amplified damage from magic, but they don't have magic resistance, so will reducing magic resistance give the same result?
If there's an orb effect item, which is more powerful? Reducing magic resistance or amplifying magic damage?
How will it respond with other magic amplification/resistance reduction spells/items?
How will that orb item affect Pugna's secondary attack?