There are four "marks" in the game - mark of kings, mark of snakes, 
mark of fire and the mark of force. The mark of fire can be found 
within the following dungeons: Perinian Depths, Fires of Hell and Mines 
of Morinia. The mark of force can be found in the Fires of Hell and Doom. 
Also make sure you visit the dungeon of Time to find out info about the cards.

To get into the Exodus Castle, type the word "EVOCARE".