Let me see if this works instead:
<?xml version="1.0" encoding="iso-8859-1"?>
<Spells>
<DataChecksum NoParse="1">
<Ignore>DisplayName,Description,IconFG,IconBG,IconColor,SoundFX,ParticleEffect,EffectScale</Ignore>
<Translate>DisplayName,Description</Translate>
</DataChecksum>
<SpellDef InternalName="FlameStrike">
<DisplayName>Flame Strike</DisplayName>
<Description>Target enemy is lashed with fierce flames and takes your attack strength in damage.</Description>
<Image>WaterCrystal_Medallion.png</Image>
<IconFG>Flame_Strike.png</IconFG>
<IconColor>32,45,243</IconColor>
<Range>-1</Range>
<SoundFX>Spell_FireBolt_01</SoundFX>
<ManaCost>3.0</ManaCost>
<SpellLevel>1</SpellLevel>
<SpellType>Tactical</SpellType>
<SpellClass>Offensive</SpellClass>
<SpellTargetType>EnemyUnit</SpellTargetType>
<IsSpecialAbility>1</IsSpecialAbility>
<GameModifier InternalName="FlameStrikeModifier">
<ModType>Unit</ModType>
<Attribute>DefendableDamage</Attribute>
<Calculate InternalName="AttackerAttack" ValueOwner="CastingUnit">
<Expression><![CDATA[[UnitStat_Attack]]]></Expression>
</Calculate>
<Calculate InternalName="MaxValue">
<Expression><![CDATA[[AttackerAttack] * -1]]></Expression>
</Calculate>
<Calculate InternalName="MinValue">
<Expression><![CDATA[[AttackerAttack] * -0.1]]></Expression>
</Calculate>
</GameModifier>
<SpellDefEffect>
<EffectName>Fire_Bolt</EffectName>
<LocalPosition>0,0,0</LocalPosition>
<EffectScale>1.5</EffectScale>
<EffectDelay>0.25</EffectDelay>
<SnapToTerrain>1</SnapToTerrain>
</SpellDefEffect>
</SpellDef>
<SpellDef InternalName="DeadlyBite">
<DisplayName>Deadly Bite</DisplayName>
<Description>A devastating bite that deals twice your attack strength in damage.</Description>
<Image>WaterCrystal_Medallion.png</Image>
<IconFG>Deadly_Bite.png</IconFG>
<IconColor>32,45,243</IconColor>
<Range>1</Range>
<SoundFX>LargeSpider_Hit1</SoundFX>
<ManaCost>3.0</ManaCost>
<SpellLevel>1</SpellLevel>
<SpellType>Tactical</SpellType>
<SpellClass>Offensive</SpellClass>
<SpellTargetType>EnemyUnit</SpellTargetType>
<IsSpecialAbility>1</IsSpecialAbility>
<GameModifier InternalName="DeadlyBiteModifier">
<ModType>Unit</ModType>
<Attribute>DefendableDamage</Attribute>
<Calculate InternalName="AttackerAttack" ValueOwner="CastingUnit">
<Expression><![CDATA[[UnitStat_Attack]]]></Expression>
</Calculate>
<Calculate InternalName="MaxValue">
<Expression><![CDATA[[AttackerAttack] * -2]]></Expression>
</Calculate>
<Calculate InternalName="MinValue">
<Expression><![CDATA[[AttackerAttack] * -0.1]]></Expression>
</Calculate>
</GameModifier>
<SpellDefEffect>
<EffectName>Deadly_Bite</EffectName>
<LocalPosition>0,0,0</LocalPosition>
<EffectScale>1.0</EffectScale>
<EffectDelay>0.0</EffectDelay>
<SnapToTerrain>1</SnapToTerrain>
</SpellDefEffect>
</SpellDef>
<SpellDef InternalName="CrushingBlow">
<DisplayName>Crushing Blow</DisplayName>
<Description>Target is struck with a powerful blow that cannot miss and deals the attacker's full attack damage.</Description>
<Image>WaterCrystal_Medallion.png</Image>
<IconFG>Crushing_Blow.png</IconFG>
<IconColor>32,45,243</IconColor>
<Range>1</Range>
<SoundFX>Hit_Hammer1</SoundFX>
<ManaCost>3.0</ManaCost>
<SpellLevel>1</SpellLevel>
<SpellType>Tactical</SpellType>
<SpellClass>Offensive</SpellClass>
<SpellTargetType>EnemyUnit</SpellTargetType>
<IsSpecialAbility>1</IsSpecialAbility>
<GameModifier InternalName="CrushingBlowModifier">
<ModType>Unit</ModType>
<Attribute>CurHealth</Attribute>
<Calculate InternalName="AttackerAttack" ValueOwner="CastingUnit">
<Expression><![CDATA[[UnitStat_Attack]]]></Expression>
</Calculate>
<Calculate InternalName="Value">
<Expression><![CDATA[[AttackerAttack] * -1.0]]></Expression>
</Calculate>
</GameModifier>
<SpellDefEffect>
<EffectName>Crushing_Blow</EffectName>
<LocalPosition>0,0,0</LocalPosition>
<EffectScale>1.5</EffectScale>
<EffectDelay>0.25</EffectDelay>
<SnapToTerrain>1</SnapToTerrain>
</SpellDefEffect>
</SpellDef>
<SpellDef InternalName="RainOfStone">
<DisplayName>Rain of Stone</DisplayName>
<Description>Stones rain down on target tile. Enemy units take 2X your attack strength in damage.</Description>
<Image>FireCrystal_Medallion.png</Image>
<IconFG>Rain_of_Stone.png</IconFG>
<IconBG>fire1_BG.png</IconBG>
<IconColor>243,45,32</IconColor>
<Range>-1</Range>
<Radius>1</Radius>
<SoundFX>Spell_EnchantLand_02</SoundFX>
<ManaCost>3.0</ManaCost>
<SpellLevel>3</SpellLevel>
<SpellType>Tactical</SpellType>
<SpellClass>Offensive</SpellClass>
<SpellTargetType>EnemyUnit</SpellTargetType>
<IsSpecialAbility>1</IsSpecialAbility>
<GameModifier InternalName="RainOfStoneModifier">
<ModType>Unit</ModType>
<Attribute>DefendableDamage</Attribute>
<Calculate InternalName="AttackerAttack" ValueOwner="CastingUnit">
<Expression><![CDATA[[UnitStat_Attack]]]></Expression>
</Calculate>
<Calculate InternalName="MaxValue">
<Expression><![CDATA[[AttackerAttack] * -2]]></Expression>
</Calculate>
<Calculate InternalName="MinValue">
<Expression><![CDATA[[AttackerAttack] * -0.1]]></Expression>
</Calculate>
</GameModifier>
<SpellDefEffect>
<EffectName>Rain_of_Stone</EffectName>
<LocalPosition>0,0,0</LocalPosition>
<EffectScale>1.6</EffectScale>
<EffectDelay>0.0</EffectDelay>
<SnapToTerrain>1</SnapToTerrain>
</SpellDefEffect>
</SpellDef>
<SpellDef InternalName="SavageStrike">
<DisplayName>Savage Strike</DisplayName>
<Description>Target enemy is dealt a heavy blow and takes 3X your attack strength in damage.</Description>
<Image>WaterCrystal_Medallion.png</Image>
<IconFG>Savage_Strike.png</IconFG>
<IconColor>32,45,243</IconColor>
<Range>1</Range>
<SoundFX>Hit_Hammer1</SoundFX>
<ManaCost>3.0</ManaCost>
<SpellLevel>1</SpellLevel>
<SpellType>Tactical</SpellType>
<SpellClass>Offensive</SpellClass>
<SpellTargetType>EnemyUnit</SpellTargetType>
<IsSpecialAbility>1</IsSpecialAbility>
<GameModifier InternalName="SavageStrikeModifier">
<ModType>Unit</ModType>
<Attribute>DefendableDamage</Attribute>
<Calculate InternalName="AttackerAttack" ValueOwner="CastingUnit">
<Expression><![CDATA[[UnitStat_Attack]]]></Expression>
</Calculate>
<Calculate InternalName="Value">
<Expression><![CDATA[[AttackerAttack] * -3.0]]></Expression>
</Calculate>
</GameModifier>
<SpellDefEffect>
<EffectName>Savage_Strike</EffectName>
<LocalPosition>0,0,0</LocalPosition>
<EffectScale>1.5</EffectScale>
<EffectDelay>0.25</EffectDelay>
<SnapToTerrain>1</SnapToTerrain>
</SpellDefEffect>
</SpellDef>
<SpellDef InternalName="Hurricane">
<DisplayName>Hurricane</DisplayName>
<Description>Target enemy is blown to a random unoccupied tile by a mighty hurricane.</Description>
<Image>WaterCrystal_Medallion.png</Image>
<IconFG>Hurricane.png</IconFG>
<IconColor>32,45,243</IconColor>
<Range>-1</Range>
<SoundFX>Spell_Wind_01</SoundFX>
<ManaCost>3.0</ManaCost>
<SpellLevel>5</SpellLevel>
<SpellType>Tactical</SpellType>
<SpellClass>Offensive</SpellClass>
<SpellTargetType>EnemyUnit</SpellTargetType>
<IsSpecialAbility>1</IsSpecialAbility>
<GameModifier InternalName="HurricaneMoveModifier">
<ModType>TacticalUnit</ModType>
<Attribute>ChanceToMoveTargetToRandomTile</Attribute>
<Value>1</Value>
</GameModifier>
<GameModifier InternalName="HurricaneDamageModifier">
<ModType>Unit</ModType>
<Attribute>DefendableDamage</Attribute>
<Calculate InternalName="AttackerAttack" ValueOwner="CastingUnit">
<Expression><![CDATA[[UnitStat_Attack]]]></Expression>
</Calculate>
<Calculate InternalName="Value">
<Expression><![CDATA[[AttackerAttack] * -0.5]]></Expression>
</Calculate>
</GameModifier>
<SpellDefEffect>
<EffectName>Confusion</EffectName>
<LocalPosition>0,0,0</LocalPosition>
<EffectScale>1.5</EffectScale>
<EffectDelay>0.25</EffectDelay>
<SnapToTerrain>1</SnapToTerrain>
</SpellDefEffect>
</SpellDef>
<SpellDef InternalName="Backstab">
<DisplayName>Backstab</DisplayName>
<Description>Target enemy strikes all adjacent enemies, dealing .5X its attack strength in true damage.</Description>
<Image>WaterCrystal_Medallion.png</Image>
<IconFG>Backstab.png</IconFG>
<IconColor>32,45,243</IconColor>
<Range>0</Range>
<Radius>1</Radius>
<SoundFX>Hit_BasicSword2</SoundFX>
<ManaCost>3.0</ManaCost>
<SpellLevel>1</SpellLevel>
<SpellType>Tactical</SpellType>
<SpellClass>Offensive</SpellClass>
<SpellTargetType>EnemyUnitIgnoreFriendly</SpellTargetType>
<IsSpecialAbility>1</IsSpecialAbility>
<GameModifier InternalName="BackstabModifier">
<ModType>Unit</ModType>
<Attribute>CurHealth</Attribute>
<Calculate InternalName="AttackerAttack" ValueOwner="CastingUnit">
<Expression><![CDATA[[UnitStat_Attack]]]></Expression>
</Calculate>
<Calculate InternalName="Value">
<Expression><![CDATA[[AttackerAttack] * -0.5]]></Expression>
</Calculate>
</GameModifier>
<SpellDefEffect>
<EffectName>Backstab</EffectName>
<LocalPosition>0,35,0</LocalPosition>
<EffectScale>0.65</EffectScale>
<EffectDelay>0.0</EffectDelay>
<SnapToTerrain>1</SnapToTerrain>
<PlayOnAllTargets>1</PlayOnAllTargets>
</SpellDefEffect>
</SpellDef>
</Spells>