Ok I can help here a little bit.
After you somehow find 500000 gold to buy yourself a Medium from the beastmaster you go to this one.
Chapter 2 - Quest 3: On expedition
The strange aura of the Medium of the Steppes brings you back to full attentiveness. It's a demented sight — the Medium has veiled its eyes yet appears to be able to perceive its environment with extraordinary precision. Abruptly it ceases its chatter and a knowing smile plays across its mouth. It names the place where the book was composed. Deep in the southern part of the country are the Swamps of Oblivion — a vast, inhospitable moor that has been avoided by all living creatures since time immemorial. There, deep in the interior of the swamps, stands a tower that is home to several powerful mages. This is where the book was created. Curiosity burns in you, but you force yourself to master it and not send out your forces right away. A rash expedition into the unknown requires a certain amount of preparation.
Store up 7,500 stews, 20,000 legs of beef, 7,500 hard alcohol and 20,000 wine
Reward: 60.000 points, 35.000 gold
Edit note for Gynde and others, when you complete this quest your army "uses" all these supplies up and they are taken
from your inventory before you go on to the next quest.