Aggro is a slang term meaning Aggravation or Aggression. In MMORPGs, aggro expresses the aggressive intent of a Mob or NPC.

Aggro is a mechanic in TERA where the more aggro you have, the more an enemy will focus attacks on a target. Having a high threat is good for defensive classes such as the Lancer and Warrior, as they have good enduring powers. Players with weaker defense want to have less of a aggro to avoid getting hit.

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