Iris Online Knight Class and Skill Guide for the Ultimate Tank
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Knight have the strongest defensive ability out of all races and classes. They can tank massive damage without being killed. During most situations, the one class that can run away safely without being killed are the Guardians.
These classes typically will level with other classes, there fore you do not need to add the skills which recover your HP in the beginning. You should focus more on the skills that increase your defense.
Because you are a tanking class, you do need to have some attacking skills in order to pull in the mobs and tank them.