Read "King of Brigantest (sp?)" in Warren Report. (only available when you beat the game) Head to Heim for event. Event in Hell Gate B88. Event in Hell Gate B98, you are now able to go deeper than B100. Fight in B115, where you have to defeat King Roderick. After the battle, Warren will join.
After series of bad lucks, there is always good luck follows. - Syuji Terayama.