Guest vocalist Oliver Hartmann (At Vance, Avantasia, Edguy, Aina, Magic Kingdom, Freedom Call, Helloween) added vocals to three tracks.

The keyboardist Richard Andersson (Majestic, Time Requiem, Space Odyssey, Karmakanic, Evil Masquerade, Adagio, Silver Seraph) is responsible for all the keyboards solos on Hordes of the Brave.

Still on bass guitar was Vassili Moltchanov, but a new drummer was found in Erik Stout (Vengeance, Joe Stump, Daize Shayne); keyboards were played by Andreas Lindahl (Wuthering Heights, The Murder of My Sweet, Narnia, Loch Vostok, Audiovision, Manticora, ZooL, Platitude).

[12][13] Due to vocalist Goetz "Valhalla Jr." Mohr's health problems, Iron Mask brought Carsten "Lizard" Schulz (Domain, Altaria, Shining Line, Eden's Curse) to perform vocal duties at their appearance at Graspop Metal Meeting on 26 June 2010 in Dessel, Belgium.

[17] On 30 April 2011, the band played a concert at Power & Prog Metal Fest (Mons, Belgium) alongside Europe, HammerFall, Gamma Ray and Vanden Plas.

[18] In July 2011 the band announced that for the forthcoming album Black as Death [19] part of vocal duties would be performed by ex-Yngwie Malmsteen singers Mark Boals (Royal Hunt, Ring of Fire) and Göran Edman (Karmakanic, Brazen Abbot, Jayce Landberg, Time Requiem).