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Turel is a conceptual Angel which never ended up being used. It is designed as a floating white "monolith" with an appearance like a face crowned by four spikes and wearing a very tall, steep miter adorned with a blue gem. It is extremely powerful, seems impervious to all attacks, and steadfastly seeks out its targets with the aim of self-destruction.
Given its combat style involving seeking out enemies and self destructing, it's possible Turel was used as inspiration for Sahaquiel, being another aerial Angel whose ultimate goal involved its own demise.
Turel is also the name of a character in the Legacy of Kain series. One of the series protagonists, Raziel, was named for Sachiel's originally intended placeholder, as also seen in the original concepts.