Spells, magic items, and certain monsters can affect characters with fear. If a fear effect allows a saving throw, it is a Will save (DC depends on the exact spell or effect). All fear attacks are mind-affecting fear effects. A failed roll usually means that the character is shaken or panicked, though sometimes may result in more severe results.
Fear effects are designed to be cumulative. A shaken character who is made shaken again becomes frightened instead. A frightened character who saves against the effect may still be shaken. Note this doesn't always work in DDO however. Only certain fear effects function this way, such as the fear spell and a couple others.
Fear Auras can freeze an opponent (such as a mummy’s despair) or function like the fear spell. Other effects are possible. A fear aura is an area effect. The descriptive text gives the size and kind of area.
Fear Cones and Rays
These effects usually work like the fear spell.
This special quality makes a creature’s very presence unsettling to foes. It takes effect automatically when the creature performs some sort of dramatic action (such as charging, attacking, or snarling). Opponents within range who witness the action may become frightened or shaken. Actions required to trigger the ability are given in the creature’s descriptive text.