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.
But "Secret" requires one to clear a special quest.
Um Geheimkünste zu erlernen,
muss man jedoch spezielle Quests erfüllen.
Pero "Secreto" requiere una misión especial.
En revanche, les techniques secrètes
s’obtiennent grâce à des quêtes,
Il grado "Segreto", però, 
va sbloccato con una missione speciale.
Só que o "Secreto", exige
 uma missão especial.
А вот для мастерского ранга придётся
 пройти персональное задание.