Kurenai is a fire-based spell from Roland. When cast, a Kurenai glyph appears which it releases a jet of fire which then expands to engulf everything within a certain area in flames.It is not as commonly used as Izuchi, but is still used in combat and other specialised uses.
"What I seek is the burning field, Kurenai!" (Motomeru wa shougen, Kurenai!) is the chant for casting the spell. Its glyph is in the shape of an eye superimposed over a pentogram.