- "Devour the brightest day. Enshroud the blackest night. Treasured sword of hell. Unite with my body as your host, and become the demonic beast of darkness that annhilates everything."
- ― Tobio Ikuse (Highschool DxD)
The user can merge with any weapon they are wielding to empower the user or prevent losing it.
- May have difficulties keeping the merge for a long period of time.
- Soul-Bound Weapons are immune unless it is the user's weapon.
- Process may be irreversible.
- Destruction of weapon may cause harm to the user.
- Merging with Demonic or Divine Weaponry may have adverse effects, depending on user's affinity.
- Steinberger (Amagi Brilliant Park)
- Teigu: Incursio (Akame ga Kill)
- Imagine Blade (Black Cat)
- Certain Zanpakutō (Bleach)
- Benizakura (Gintama)
- Dakki (InuYasha)
- Sō'unga (InuYasha)
- Ghost ÄRMs (Marchen Awakens Romance)
- Samehada (Naruto)
- Shichiseiken (One Piece)
- Ragnarok (Soul Eater)
- Fusion Sword Murasame Blade (Yu-Gi-Oh!)
- Fusion Weapon (Yu-Gi-Oh!)