I am not a fan of magic caster. You never see me using them except for their teleport skill. I have seen a few Bozel in action. This character is pretty powerful at high level.
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He is the most powerful and useful mage, many thanks to his own self faction buff and he has access to both high lvl debuff aoe skills, earthquake and blackhole.
You will want build him later as high lvl contents, like 60+ dragons, its nearly impossible to solo (and get realm buff) if you do not have some form of guaranteed atk debuff on the boss. Its pretty generous of them to give away such a powerful char for free in event, which never happens again.....
Bozel + almeeda helps to keep boss debuffed, increasing survivability of the team.