Phideark
Phideark was a Captain in the Iron Warriors Legion, during the Horus Heresy and he took part in the Battle of Beta-Garmon.[1]
There he served as the second-in-command of Warsmith Xyrokles's Grand Company, as it placed defense lasers on Epsilon-Garmon II, though he was constantly belittled and criticized by his superior. However several of these lasers were destroyed by the White Scars, which led Xyrokles to plan an ambush against the Loyalists, using their own tactics against them. The Iron Warriors were unaware, however, that the White Scars' Primarch, Jaghatai Khan, led them in the battle and he saw through the Warsmith's plans. After they launched their ambush, the Iron Warriors were soon all killed by hidden White Scars forces, which had been lying in wait for them.[1]