Unlike regular monsters in Ragnarok Online, Great Monsters have an Aggro system, similar to what is seen on other MMORPGs.
When engaging a Great Monster, all players in range will build a small amount of aggro, applying the Disengaged status on each player.
Each action taken by any player against that Great Monster will generate Aggro in varying amounts. This can be something as simple as dealing damage, healing a player who has any amount of Aggro, or even using an element the mob is weak to.
The player with most Aggro will be the main target of the Monster, although some Monsters may have specific mechanics that prioritize lower Aggro targets.
Your current Aggro is indicated by a status icon, while you're engaged with said monster. Each icon is indicated by its distinctive color.
Disengaged: Player has been noted, but not regarded as a threat.
Perceived: Player has been gaining more and more attention.
Recognized: Player has been recognized as a potential threat.
Aggro'd: Player has been recognized as a severe threat. They will be the main target of the Great Monster.
- Players slowly lose Aggro over time, if they're not in combat.
- Aggro is removed entirely on death.
- Aggro has a 20% threshold when trying to take it away from another player.
- This allows the current tank to react properly before the Monster change targets, but it can be a double-edged sword, as the tank will have to work harder to get it back.
- Some role abilities, such as Sentinel from Tank and Subdued Strikes from Damage can manipulate Aggro in different ways.