In January 2013, Au5 and Brazilian duo I.Y.F.F.E. won a 2012 remix contest held by Seven Lions for their drumstep remix of his dubstep track "Days To Come". The remix was released on Skrillex's label OWSLA. Au5 described this in April 2013 as one of several turning points in his music career.
In February 2013, Au5 joined Canadian label Monstercat and released the electro house track "Sweet" with Icelandic producer Auratic and I.Y.F.F.E. In May, Au5 and Fractal released "Halcyon", a drumstep track, which reached number one on Beatport's dubstep chart. In July, Au5 collaborated with BT and English musician Aqualung on BT's house track "Surrounded", from the album A Song Across Wires. Au5 and Fractal also made a dubstep remix of "Surrounded". The tracks were released on Dutch label Armada Music. In August, Au5 released his first EP on Monstercat, Blossom, featuring two tracks, "Blossom" (dubstep) and "Moonland" (drum and bass/drumstep). In December, he released the four-track Secret Weapon EP with Fractal.