World of Warcraft Talents are special abilities that can be chosen to augment your character. Talents are class-specific, and a majority of choices depend on specialization. Talents offer a further level of customization beyond class and specialization selection, and can be changed very easily and cheaply. Talents are limited by levels, with a new tier available each 15 levels for all classes except death knights and demon hunters. Talents may be passive bonuses or active abilities. Each class has its own selection, with 21 talents split over 7 tiers.
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Some Talents are available, and the rest are greyed out. This is because you first need to assign points to the first tier of talents before proceeding to the next tier of talents. In Tier 1 you can place Talent Points as soon as you reach level 10, in order to unlock Tier 2 requires 5 points in that tree, and each subsequent tier requires an extra 5 points in the tree before being able to put points in the next tier of talents. The 7th tier has only 1 talent and is usually considered an "Ultimate" talent for that tree and is almost very useful.
Talent trees: This is from classic WoW. You start talents which are also prerequisites for later talents deeper into tree and so on. There are many different paths to take in the tree for uniqueness.
Talent rows: This is from current WoW. Every so often as you hit level milestones (level 15, 30, 45, etc), you are given access to a new row of talents to choose from. A talent row has a certain number of talents in it, but you can only choose one of them.
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