'Aggro' is commonly used in two ways, one proper, one improper but often used anyways. It's first, proper use is to describe the way a monster notices and attacks you. Whether you’re level 1 or level 75, there will be some monsters that will attack you. If the monster doesn’t /check “Too Weak To Be Worthwhile” - even if they do, when you're resting - they might aggro you. What each enemy aggros to is typically noted within each entry on this Wiki. Common methods of detection are as follows: