Raven Emperor is an original speedcore track composed by Kobaryo for maimai DX UNiVERSE, released on December 10, 2021. As the founder of the HIT-NEX TRAX label and a core member of the HARDCORE TANO*C collective, Kobaryo brings his signature high-energy, metal-infused speedcore sound to the maimai arcade series. At a relentless 205 BPM, the track layers pounding kick patterns with aggressive synth leads and orchestral flourishes, evoking a regal, battle-ready atmosphere that matches its title. The song debuted within the Metropolis Area 4 (メトロポリスちほー4) progression system, requiring players to accumulate 612 km of in-game distance to unlock it, placing it alongside other area challenge tracks such as Alcyone and Yorugao. It remained gated behind area progress until the FESTiVAL update on September 15, 2022, when it became available by default across Japan and international regions. An extended version, Raven Emperor -Absolute Version-, appears on Kobaryo's album SUPER KEY GENERATOR and was later included in the maimai DX Best Album Area 2 soundtrack. The video (ムービー) was created by Taiyo Yamamoto and Sam Yolji (サム・ヨルジ). The song is purely instrumental with no lyrics. Its in-game flavor text introduces world-building lore around five machine units serving a figure named Kurohime (黒姫), each with a distinct domain, swordsmanship, raw power, stealth command, advanced technology, and machine development, tying the track into the broader Metropolis area narrative. On the charting side, the MASTER chart (Lv. 14, constant 14.5) by 翠楼屋 (Suirouya) totals 888 notes, while the EXPERT chart (Lv. 12, constant 12.0) was handled by ロシェ@ペンギン (Rocher@penguin).