The Warlord
Since at least the 19th century, there has been a man who has been present throughout the Loonivearth's battles: the man called the Warlord. Wearing a knight's armor which conceals his face, he has been sighted at many significant historical events. Much of his methods and motivations remain unclear, but one thing is constant: many of his plans and devices revolve around sig files.
In fact, the Warlord is a legacy of warriors who preserve the illusion they are a single immortal being. Much of the Warlords' history remains mysterious, but it is known that <more later>
Notes
Based on the usenet newsgroup alt.fan.warlord. <more later>
The Warlord was introduced as something of a red herring: someone who could have been Acton Lord after entering the Source Code, or even a resurrected Sig.Lad. The actual fate of Acton Lord was quite different.