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Enemies damaged by your Arcane spells are affected with Arcane Weakness, increasing damage taken by X% for X seconds.

Diablo III Pre-release Wizard Skills

Storm SkillsCharged BoltThunderstruckEmpowered MagicLightning SpeedStorm ArmorFrost NovaDeep FreezePower ArmorStatic ChargeElectrocuteRay of FrostLethal EnergyImproved Charged BoltStatic ResidueBlizzardStorm PowerEpic StormsShattering IceTornado
Arcane SkillsMagic MissileArcane PowerEfficient MagicsPenetrating SpellsDisintegrateWave of ForceArcane ArmorArcane WeaknessArcane SpeedArcane OrbSlow TimeArcane DistortionMana RecoveryImproved Magic MissileTemporal ArmorTeleportGreater ManaMana BurstRunic Might
Conjuring SkillsSpectral BladeSpell SpeedWeapon MasteryDamage ResistanceStone SkinMirror ImageConjured ArmorConjured HealthDuplicate ConjuringMeteor StormAcid CloudConjured PowerConjured DurationImproved Spectral BladeHydraMagic WeaponMagical ImpactSlowing StrikesArmor Piercing