Rise of the Warlock King
The half-elf Warlord Benang had been a sell-sword and cutthroat before he became first a bodyguard of Nophkeh the Demon Warlock, and then a Warlord. It is believed that Benang was trusted above all other Warlords and was given exemptions and boons that none others were. It therefore comes as little surprise that Benang was able to assassinate Nophkeh. The only mystery is the motive.
Following the assassination, Warlord Benang immediately led his army east and seized the city of Feneris to use as a base of operation. When other Warlords tried to take their revenge upon him he could then retreat within the solid walls of Feneris.
During the wars that came, Warlord Benang fought very little and then only secure lands around Feneris itself.