Wohooo, I just bought some earth charms.
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Mystical earth IV
Level Req: 5
Spell Damage: 34 to 59
Mana Cost: 29
+78% Enhanced Effect
+1% Mind Numb
+1% Physical Damage Reduction
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Magical earth V
Level Req: 10
Spell Damage: 67 to 118
Mana Cost: 37
+98% Enhanced Effect
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Rare earth VI
Level Req: 15
Spell Damage: 63 to 110
Mana Cost: 45
+119% Enhanced Effect
+1% Experience Gained
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Rare earth VII
Level Req: 20
Spell Damage: 76 to 134
Mana Cost: 53
+128% Enhanced Effect
+1 to 10 Life per Kill
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Rare earth VIII
Level Req: 25
Spell Damage: 93 to 163
Mana Cost: 61
+144% Enhanced Effect
+3% Mana Syphon