Players assemble and paint individual 28-millimetre (1.1 in) scale miniature figures that represent futuristic soldiers, monsters and armoured fighting vehicles. These figurines are collected to constitute squads in armies that can be pitted against those of other players. Each player brings a roughly equal complement of units to a tabletop battlefield with handmade or purchased terrain. The players then decide upon a scenario, ranging from simple skirmishes to complex battles involving defended objectives and reinforcements. The models are physically moved around the table and the actual distance between models plays a role in the outcome of combat. Play is turn-based, with various outcomes determined by tables and the roll of dice. Battles may last anywhere from a half-hour to a whole weekend, and battles may be strung together to form campaigns. Many game and hobby stores host games, and official gaming events are held on a regular basis, such as the Throne of Skulls. According to the tales of Eldar Mythology, the spectral creatures known as banshees are the harbingers of grief and death. It is said that their cry heralds misfortune and the certainty of coming death, and calls forth dead spirits from the Warp. Even worse from the Eldar point of view, are those stories which claim that a banshee's cry may even call the spirits of the dead out from the safety of their Spirit Stones and thus lure them into the waiting embrace of Slaanesh, She Who Thirsts. What is known is that the release of an Eldar spirit into the Warp is always accompanied by a terrible shriek, one which is felt by the soul rather than heard, and that Eldar spirits have been known to disperse unexpectedly into the Immaterium during the transference between Spirit Stones or even from a Spirit Stone into a Craftworld's Infinity Circuit. Each Warrior Aspect has its own distinctive helmet, and within each shrine the helmet may vary in form slightly, with correspondingly more elaborate versions for the shrine's Exarchs. A standard Howling Banshees Aspect Warrior's Banshee Mask is tall with their long flowing hair spilling from the top of it like a lion's mane. Their distinctive Banshee Masks contain psychosonic aplifiers that magnify their keening battle screams into mind-destroying shockwaves. This inflicts severe damage to the central nervous system of the Eldar warrior's foe, inspiring feeling of mortal terror and causing momentary paralysis. By custom, it is this helmet that marks the Aspect Warriors as the protectors and avengers of their Craftworld. It bears the Howling Banshees Aspect rune traced upon its forehead.