Talk:Haunting Guise/@comment-189.46.96.142-20120806044904/@comment-88.186.19.90-20120928175406

Magic PENETRATION does NOT go below 0 MR.

Magic REDUCTION DOES go below 0 MR.

However, magic reduction applies before magic penetration, so if you have 20 magic reduction and 14 magic penetration against an enemy who has 30 MR, you will deal damage as if the opponent had 0 MR:

30-20=10MR from the reduction.

10-14 from the penetration, BUT you can't go below 0 with penetration so total MR =0