The 18-year-old youngster will step into the shoes of Charlie "zeph" Dodd, who was removed from the active lineup after an eight-month stint that was accompanied with mediocre results.
During his time with rewound, Valiance finished top four in the Asia Minor Oceania closed qualifier alongside a top-eight placement in ESEA MDL Season 31 Australia.
Valiance kicks off his professional career with ORDER
In addition, he has won CGPL Championship 2018, which is one of Australia's most notable LAN events despite the top domestic teams skipping it to allow the younger generation to accumulate experience in an offline environment.
ORDER will play their first official match with Valiance in the upcoming ESL Australia & New Zealand Championship Season 9 league against Justice on Wednesday.
Currently ranked 70th in the world, the Australian side now consists of:
Chris "emagine" Rowlands
Alistair "aliStair" Johnston
Joshua "INS" Potter
Jordan "Hatz" Bajic
Matthew "Valiance" Hartrick
Chris "Elmapuddy" Tebbit (coach)