Some monster abilities will hit multiple characters, so long as they are in front of the mob. "In front" generally means the 45° arc in the direction the mob is facing, although this can vary, along with the length of the cone, depending on the monster and ability being used. If the ability does damage, the targets will take less damage the further they are from the middle of the cone.
Some of these abilities fall into categories frequently called "Breath" or "Gaze" by NA players. Gaze attacks are denoted below with a *, and can be avoided by turning one's back on the monster before it uses the ability.
Monster Abilities that are Cone Attacks
Species Ability Effect Antica Magnetite Cloud Weight and Earth damage Birds Wing Cutter Wind damage Bugard Awful Eye Strength Down Bugard Heavy Bellow Stun Crawler Poison Breath Poison and Water damage. Crawler Sticky Thread Slow Demons Hecatomb Wave Blind and Wind damage Tauri Mortal Ray * Doom Lizards Baleful Gaze * Petrification Cockatrice Baleful Gaze * Petrification Eruca Incinerate Fire damage Hound Poison Breath Poison Scorpion Cold Breath Ice damage and Bind Scorpion Numbing Breath Damage and Paralyze Sea Monk Ink Jet Blind
Note that this list is by no means exhaustive.
Blue Magic that falls under the category Cone Attacks
Species Level to use Spell Name Element Effect Tigers 20 Claw Cyclone Physical Hounds 22 Poison Breath Water Poison Antica 46 Magnetite Cloud Earth Weight Bugard 46 Awful Eye Water Strength Down Hippogryphs 48 Jettatura Dark Terror Diremites 52 Filamented Hold Earth Slow Demons 54 Hecatomb Wave Wind Blind Morbols 61 Bad Breath Earth Multiple including Slow, Poison, Silence, Paralyze, Weight, Bind and Blind. Qiqirn 66 Sandspray Dark Blind Raptors 66 Frost Breath Ice Paralyze Manticores 71 Heat Breath Fire