The large red dragon was a S rank monster called Elder Solar Drake. This was an extremely powerful monster with a very pure dragon bloodline. There were actually many dragons who would not be as strong as this drake. But still this drake was not a true dragon because its bloodline was not complete.
There were quality differences among bloodlines. A complete draconic bloodline of lower quality would not be as good as an incomplete higher quality draconic bloodline and that exactly was the case here. So with the bloodline of a Solar Dragon, this drake was without a doubt extremely powerful.
Hyneward noticed that summoning and maintaining this drake was not easy for Shiya. He judged that at most she would be able to keep the dragon here for 10 minutes. If they started to exchange blows then that time would become even less.
