My Game Guide

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Novice
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Magic Arrow(Lvl1)(Remove Skill When Rank Becomes Apprentice.)
Burning Hand(Lvl1)(Remove Skill When Rank Becomes Apprentice.)
Freeze(Lvl1)(Remove Skill When Rank Becomes Apprentice.)
Regeneration(Lv1)

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Apprentice(Since you only have 1 AoE skill,So you need Limit 1 Skill.)
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Magic Blast(Lvl1)(Remove Skill When Rank Becomes Regular.)
Dig Bomb(Lv3)
Icicle Shower(Lv1)(Remove Skill When Rank Becomes Regular.)
Regeneration(Lv2)

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Regular(Since 2 AoE Skill,Now is gonna be fun.)
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Hydro Disk(Lv3)
Regeneration(Lv3)
Weaken(Max lvl when G.Master)

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Expert(Now Mad AoEr.)
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Hardness(Max lvl when G.Master)
Acid Trap(Lv3)
Crystal Cannon(Lv3:Why choose this?Cuz Magic Amp is better than DMG.)

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A.Expert(SUPER COOL SKILL!)
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Vacuum(Lv3)
Chain Exposion(Lv1)
Energy Field(Lv5:Why Add Higher?Limit 3:Atk a big place.)
(Remove Acid Trap,Hydro Disk and Dig Bomb)(You only need 3 AoE skill.)

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Master
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Hail Storm(Lv9)

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A.Master
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Artic Field(Lv12)
High Regeneration(Any level)

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G.Master
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Extreme Dual Cannon(Lv9)

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Completer
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Space Collapse(Max lvl)
Remove Chain Explosion,Vacuum.

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Transcender
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Up to you =P