A branch form of Ignition weapons are compression Weapons. In Ignition mode, certain Compression weapons like the Green April are capable of becoming far more powerful when decompressed. Ignition weapons are supposedly quite rare on the lower Floors of the Tower, as Androssi was very surprised when she first saw Narumada.
Another type of Ignition weapon are the Living Ignition Weapons, living beings with an Ignition Weapon inserted in them, created after extensive research and experimentation by the scientists of the Workshop. By injecting ignition liquid and a unique creature into the subject  one may create a Living Ignition Weapon. However many of the subjects that make up the experimental group perished due to side effects of injections . The current known Living Ignition Weapons are Beniamino Ilmar, Beniamino Cassano, Jyu Viole Grace, Beta and Emile.
- ↑ 1.0 1.1 Vol.2 Ch.42: 28F – Devil of the Right Arm (1)
- ↑ Vol.2 Ch.144: 30F - Hell Train: Revolution Road (32)