Druid tactics

Caster druid
Druids lack direct AoE damage. They have a few potent single target SLAs and spells. To effectively destroy large groups of mobs, druids usually gather a large amount of monsters, drop them prone via Earthquake and then layer multiple area-of-effect damage-over-time spells to roast/freeze them.

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Melee wolf druid
Melee druids that fight in Wolf or Winter Wolf wild shape usually extraordinarily fast attack speed. Therefore, avoid special attacks that interrupt your attack chain, for example Cleaves. One special attack that performs excellently for wolves is Tempest's Dance of Death.

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Melee bear druid
Because of the penalty to attack speed, bear druids are rather weak. They can overcome some of their weaknesses by picking up many special attacks that interrupt the attack animation, particularly Cleaves.