Shiroe and his friends have come to the Depths of Palm to reach the Sacrifice Clan's gold.  The underground labyrinth is filled with powerful monsters that wear them down in a war of attrition.  Meanwhile, Akihabara, Akatsuki hears about the "Teachings".  She's very interested to know that by completing a high level raid, she can greatly improve the level of her techniques.
Raid zones have anywhere from five to ten 
special monsters called "raid bosses."
Las zonas de raid tienen entre cinco y diez 
monstruos especiales llamados jefes de raid.
Dans une zone de raid, on trouve
de cinq à dix monstres spéciaux,
Le zone raid hanno tra i cinque 
e i dieci mostri speciali: i raid boss.
As áreas de incursão têm entre 5 e 10 
monstros especiais chamados Raid Bosses.
В рейдовой зоне водится
 пять-десять особых монстров.