He was born in Quantium, to a military family who lives near Warlock's Walk.
AfterWorked as a mercenary guard in the mana wastes, working with the trade between Alkenstar and Nex.
He managed to capture a musket during an attack, and worked on getting trained in its use.
After things got a little hot in Alkenstar, Sefu decided to settle down in Quantium and joined the Guard.
Over twelve years he slowly worked his way up to the exalted rank of sergeant, leading a squad of 6 in keeping the peace near the Bandeshar.
When he found a young man viciously and brutally beating a prostitute, Sefu taught him a lessons that unintentionally left the man nearly crippled. The man turned out to be a counsellor's son and as a result Sefu was 'promoted sideways' into the Spooky Squad, but not given command (making him an extremely Senior Guard).
Sefu is actually happy with the change as the Spooky Squad lets him use his Musket far more often, and is often much more black and white.