Magic Resistance was poorly documented, and confusingly applied in 1st edition. According to the Monster Manual (pp 5-6), the chance of a spell failing due to Magic Resistance was dependent upon the level of the caster. The Monster Manual was the first of the core rulebooks, and listed, under Elves, a 90% resistanceto Sleep and Charm. Unfortunately when the Players Handbookcame out, it changed that resistance to a FLAT 90%, for PC elves. That has caused no end of confusion. In 2nd edition, the level dependence for Magic Resistance was dropped, making all Magic Resistance a FLAT resitance. Magic Resistance was dropped altogether in 3rd edition and later
The table below is for 1st edition. For completeness,the yellow row can be applied to 2nd edition.
  |  
|  
| 5
| 10
| 15
| 20
| 25
| 30
| 35
| 40
| 45
| 50
| 55
| 60
| 65
| 70
| 75
| 80
| 85
| 90
| 95
| 100
| 105
| 110
| 115
| 120
| 125
| 130
| 135
| 140
| 145
| 150
| Caster's Level
| -2
| 70
| 75
| 80
| 85
| 90
| 95
| 100
| 105
| 110
| 115
| 120
| 125
| 130
| 135
| 140
| 145
| 150
| 155
| 160
| 165
| 170
| 175
| 180
| 185
| 190
| 195
| 200
| 205
| 210
| 215
| -1
| 65
| 70
| 75
| 80
| 85
| 90
| 95
| 100
| 105
| 110
| 115
| 120
| 125
| 130
| 135
| 140
| 145
| 150
| 155
| 160
| 165
| 170
| 175
| 180
| 185
| 190
| 195
| 200
| 205
| 210
| 0
| 60
| 65
| 70
| 75
| 80
| 85
| 90
| 95
| 100
| 105
| 110
| 115
| 120
| 125
| 130
| 135
| 140
| 145
| 150
| 155
| 160
| 165
| 170
| 175
| 180
| 185
| 190
| 195
| 200
| 205
| 1
| 55
| 60
| 65
| 70
| 75
| 80
| 85
| 90
| 95
| 100
| 105
| 110
| 115
| 120
| 125
| 130
| 135
| 140
| 145
| 150
| 155
| 160
| 165
| 170
| 175
| 180
| 185
| 190
| 195
| 200
| 2
| 50
| 55
| 60
| 65
| 70
| 75
| 80
| 85
| 90
| 95
| 100
| 105
| 110
| 115
| 120
| 125
| 130
| 135
| 140
| 145
| 150
| 155
| 160
| 165
| 170
| 175
| 180
| 185
| 190
| 195
| 3
| 45
| 50
| 55
| 60
| 65
| 70
| 75
| 80
| 85
| 90
| 95
| 100
| 105
| 110
| 115
| 120
| 125
| 130
| 135
| 140
| 145
| 150
| 155
| 160
| 165
| 170
| 175
| 180
| 185
| 190
| 4
| 40
| 45
| 50
| 55
| 60
| 65
| 70
| 75
| 80
| 85
| 90
| 95
| 100
| 105
| 110
| 115
| 120
| 125
| 130
| 135
| 140
| 145
| 150
| 155
| 160
| 165
| 170
| 175
| 180
| 185
| 5
| 35
| 40
| 45
| 50
| 55
| 60
| 65
| 70
| 75
| 80
| 85
| 90
| 95
| 100
| 105
| 110
| 115
| 120
| 125
| 130
| 135
| 140
| 145
| 150
| 155
| 160
| 165
| 170
| 175
| 180
| 6
| 30
| 35
| 40
| 45
| 50
| 55
| 60
| 65
| 70
| 75
| 80
| 85
| 90
| 95
| 100
| 105
| 110
| 115
| 120
| 125
| 130
| 135
| 140
| 145
| 150
| 155
| 160
| 165
| 170
| 175
| 7
| 25
| 30
| 35
| 40
| 45
| 50
| 55
| 60
| 65
| 70
| 75
| 80
| 85
| 90
| 95
| 100
| 105
| 110
| 115
| 120
| 125
| 130
| 135
| 140
| 145
| 150
| 155
| 160
| 165
| 170
| 8
| 20
| 25
| 30
| 35
| 40
| 45
| 50
| 55
| 60
| 65
| 70
| 75
| 80
| 85
| 90
| 95
| 100
| 105
| 110
| 115
| 120
| 125
| 130
| 135
| 140
| 145
| 150
| 155
| 160
| 165
| 9
| 15
| 20
| 25
| 30
| 35
| 40
| 45
| 50
| 55
| 60
| 65
| 70
| 75
| 80
| 85
| 90
| 95
| 100
| 105
| 110
| 115
| 120
| 125
| 130
| 135
| 140
| 145
| 150
| 155
| 160
| 10
| 10
| 15
| 20
| 25
| 30
| 35
| 40
| 45
| 50
| 55
| 60
| 65
| 70
| 75
| 80
| 85
| 90
| 95
| 100
| 105
| 110
| 115
| 120
| 125
| 130
| 135
| 140
| 145
| 150
| 155
| 11
| 5
| 10
| 15
| 20
| 25
| 30
| 35
| 40
| 45
| 50
| 55
| 60
| 65
| 70
| 75
| 80
| 85
| 90
| 95
| 100
| 105
| 110
| 115
| 120
| 125
| 130
| 135
| 140
| 145
| 150
| 12
| 0
| 5
| 10
| 15
| 20
| 25
| 30
| 35
| 40
| 45
| 50
| 55
| 60
| 65
| 70
| 75
| 80
| 85
| 90
| 95
| 100
| 105
| 110
| 115
| 120
| 125
| 130
| 135
| 140
| 145
| 13
| -5
| 0
| 5
| 10
| 15
| 20
| 25
| 30
| 35
| 40
| 45
| 50
| 55
| 60
| 65
| 70
| 75
| 80
| 85
| 90
| 95
| 100
| 105
| 110
| 115
| 120
| 125
| 130
| 135
| 140
| 14
| -10
| -5
| 0
| 5
| 10
| 15
| 20
| 25
| 30
| 35
| 40
| 45
| 50
| 55
| 60
| 65
| 70
| 75
| 80
| 85
| 90
| 95
| 100
| 105
| 110
| 115
| 120
| 125
| 130
| 135
| 15
| -15
| -10
| -5
| 0
| 5
| 10
| 15
| 20
| 25
| 30
| 35
| 40
| 45
| 50
| 55
| 60
| 65
| 70
| 75
| 80
| 85
| 90
| 95
| 100
| 105
| 110
| 115
| 120
| 125
| 130
| 16
| -20
| -15
| -10
| -5
| 0
| 5
| 10
| 15
| 20
| 25
| 30
| 35
| 40
| 45
| 50
| 55
| 60
| 65
| 70
| 75
| 80
| 85
| 90
| 95
| 100
| 105
| 110
| 115
| 120
| 125
| 17
| -25
| -20
| -15
| -10
| -5
| 0
| 5
| 10
| 15
| 20
| 25
| 30
| 35
| 40
| 45
| 50
| 55
| 60
| 65
| 70
| 75
| 80
| 85
| 90
| 95
| 100
| 105
| 110
| 115
| 120
| 18
| -30
| -25
| -20
| -15
| -10
| -5
| 0
| 5
| 10
| 15
| 20
| 25
| 30
| 35
| 40
| 45
| 50
| 55
| 60
| 65
| 70
| 75
| 80
| 85
| 90
| 95
| 100
| 105
| 110
| 115
| 19
| -35
| -30
| -25
| -20
| -15
| -10
| -5
| 0
| 5
| 10
| 15
| 20
| 25
| 30
| 35
| 40
| 45
| 50
| 55
| 60
| 65
| 70
| 75
| 80
| 85
| 90
| 95
| 100
| 105
| 110
| 20
| -40
| -35
| -30
| -25
| -20
| -15
| -10
| -5
| 0
| 5
| 10
| 15
| 20
| 25
| 30
| 35
| 40
| 45
| 50
| 55
| 60
| 65
| 70
| 75
| 80
| 85
| 90
| 95
| 100
| 105
| 21
| -45
| -40
| -35
| -30
| -25
| -20
| -15
| -10
| -5
| 0
| 5
| 10
| 15
| 20
| 25
| 30
| 35
| 40
| 45
| 50
| 55
| 60
| 65
| 70
| 75
| 80
| 85
| 90
| 95
| 100
| 22
| -50
| -45
| -40
| -35
| -30
| -25
| -20
| -15
| -10
| -5
| 0
| 5
| 10
| 15
| 20
| 25
| 30
| 35
| 40
| 45
| 50
| 55
| 60
| 65
| 70
| 75
| 80
| 85
| 90
| 95
| 23
| -55
| -50
| -45
| -40
| -35
| -30
| -25
| -20
| -15
| -10
| -5
| 0
| 5
| 10
| 15
| 20
| 25
| 30
| 35
| 40
| 45
| 50
| 55
| 60
| 65
| 70
| 75
| 80
| 85
| 90
| 24
| -60
| -55
| -50
| -45
| -40
| -35
| -30
| -25
| -20
| -15
| -10
| -5
| 0
| 5
| 10
| 15
| 20
| 25
| 30
| 35
| 40
| 45
| 50
| 55
| 60
| 65
| 70
| 75
| 80
| 85
| 25
| -65
| -60
| -55
| -50
| -45
| -40
| -35
| -30
| -25
| -20
| -15
| -10
| -5
| 0
| 5
| 10
| 15
| 20
| 25
| 30
| 35
| 40
| 45
| 50
| 55
| 60
| 65
| 70
| 75
| 80
| 26
| -70
| -65
| -60
| -55
| -50
| -45
| -40
| -35
| -30
| -25
| -20
| -15
| -10
| -5
| 0
| 5
| 10
| 15
| 20
| 25
| 30
| 35
| 40
| 45
| 50
| 55
| 60
| 65
| 70
| 75
| 27
| -75
| -70
| -65
| -60
| -55
| -50
| -45
| -40
| -35
| -30
| -25
| -20
| -15
| -10
| -5
| 0
| 5
| 10
| 15
| 20
| 25
| 30
| 35
| 40
| 45
| 50
| 55
| 60
| 65
| 70
| 28
| -80
| -75
| -70
| -65
| -60
| -55
| -50
| -45
| -40
| -35
| -30
| -25
| -20
| -15
| -10
| -5
| 0
| 5
| 10
| 15
| 20
| 25
| 30
| 35
| 40
| 45
| 50
| 55
| 60
| 65
| 29
| -85
| -80
| -75
| -70
| -65
| -60
| -55
| -50
| -45
| -40
| -35
| -30
| -25
| -20
| -15
| -10
| -5
| 0
| 5
| 10
| 15
| 20
| 25
| 30
| 35
| 40
| 45
| 50
| 55
| 60
| 30
| -90
| -85
| -80
| -75
| -70
| -65
| -60
| -55
| -50
| -45
| -40
| -35
| -30
| -25
| -20
| -15
| -10
| -5
| 0
| 5
| 10
| 15
| 20
| 25
| 30
| 35
| 40
| 45
| 50
| 55
| |