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Improved Spell Resistance I: Increases your spell resistance to nondamaging spells and effects, granting you SR 14.
|AP Cost: 1
Improved Spell Resistance II: Increases your spell resistance to nondamaging spells and effects, granting you SR 16.
|AP Cost: 2
||Requires: Improved Spell Resistance I
Improved Spell Resistance III: Increases your spell resistance to nondamaging spells and effects, granting you SR 18.
|AP Cost: 3
||Requires: Improved Spell Resistance II
Improved Spell Resistance IV: Increases your spell resistance to nondamaging spells and effects, granting you SR 20.
|AP Cost: 4
||Requires: Improved Spell Resistance III
 Removed in Update 8
As of Update 8 the Drow Spell Resistance line of enhancements has been removed. Drow now inherently possess Spell Resistance equal to 10 + Character Level.
 Hard nurf in 3.3 update
This enhancement line used to be way more effective than as is, but got nurfed pretty hard in 3.3 enhancement revamp.
Now days it is barely taken, as SR 20 for 10 action points dosen't worth it at all, compared to SR 19 random loot (belt or ring slot), SR 22 raid loot (Ring of Thelis) or cleric Spell Resistance buff (caster level + 12 SR).
 Pre-3.3 stats
||Improved Spell Resistance I
||Total SR: 12
||Improved Spell Resistance II
||Total SR: 13
||Improved Spell Resistance III
||Total SR: 14
||Improved Spell Resistance IV
||Total SR: 15
||Improved Spell Resistance V
||Total SR: 16
||Improved Spell Resistance VI
||Total SR: 17
||Improved Spell Resistance VII
||Total SR: 18
||Improved Spell Resistance VIII
||Total SR: 19
||Improved Spell Resistance IX
||Total SR: 20
||Improved Spell Resistance X
||Total SR: 21
||Improved Spell Resistance XI
||Total SR: 22