Creatures that have been "Marked", have been called out by a commander type creature; as such they have had a spotlight placed upon them for the commanders allies.
Creatures afllicted with "Marked" take 1D4+(Level or CR) damage from non-magical projectiles and the following Weapons:
Melee: Handaxes, Javelins, Maces, Quaterstaffs, Sickles, Spears, Battle Axes, Glaives, Great Axes, Halberds, Mauls, Morningstars, Pikes, Rapiers, Sabers, War Picks, Warhammers and Scythes.
Ranged (Non-Magical): Crossbow (light), Shortbow, Crossbow (Hand), Crossbow (Heavy) & Longbow.