Progress within different schools is split into 6 tiers. Tiers span an average of 20 levels. Mobs and resources are normally grouped together by tier in certain parts of the world.

Tiers Tier I Tier II Tier III Tier IV Tier V Tier VI
Levels 0 - 19 20 - 39 40 - 59 60 - 79 80 - 99 100 +

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