In late 2003, Jeff Dormer (ex-Antiquus/ex-Censure), originally from Vancouver, Canada, would join on as Mastery's new lead guitarist and songwriter.
2004 would prove to be the year that Mastery would become a serious operation. Some house cleaning first commenced with vocalist Maxel Black leaving in May 2004 to join the newly forming Penetrator. The next to change was the drums when ex-Candle Opera man Kevan Roy, drawing inspiration in genres ranging from jazz to progressive metal, joined to further define the Mastery sound. Bassist Anthony Ritovskion joined in 2005, introduced to Mastery by Roy at the music store where they both were teaching, to offer the band his wide musical tastes and influences. But all was not well with the Mastery team, however, for only a few months earlier Dormer left after their November 14, 2004 show at Toronto's 'Kathedral' bar; he would return to play with the band in 2005.
But their problems were still not over for still without a singer and dubbing themselves as "InstruMetal", their appearance at the 2005 Megadeth sponsored 'Gigantour' pre-show was cancelled when the officials believed the band misrepresented itself on its advertising of their role in the event from a web poster showing them as a band on the main stage. Officials were even less impressed with the band's less than apologetic public response on the matter. Unrelated to that, their 2006 tour was also cancelled shortly before their Lethal Legacy (2006) was released to a quiet response. Dormer would eventually drift away again and move back to Vancouver.
Briefly, Anthony Tuttolomondo (vocals; Profaner/ex-Elwood Blatch), Kerry Saxena (drums), Tim Casterline (bass; M.O.D.), Mike Harshaw (drums; ex-Annihilator, ex-Nexus, ex-Philosofear, ex-Profaner) and Kelly Fitzsimons (guitars; Carry the Storm) would be featured in the band.
Mastery would trudge on with no releases until In the Key of Kill in 2012 with the membership of Billy Milano (vocals), Markus Armellini (guitar), Morgan Rider (bass) and Mike Harshaw (drums). Soon after, Oscar Rangel would take over bass, while Johnny Macri assumed drums, leaving the act as a three-piece.
The band would return in 2020 with the release of Severing the Earth under the membership of Oscar Rangel (bass), Johnny Macri (drums), Markus Armellini (guitars (rhythm)) and Carl Crosswhite (vocals).Footnotes:- Derek McDonald (Diskery author) knew Jeff Dormer.- Do not confuse this Mastery with the Brazilian band of the same name that released two demos from 2002-2008 then folded.