The monster that Reign had taken with him was a balanced type of monster. It was fast, but not as fast as some other monsters of the same realm, it was strong, but there were stronger ones, there were those with better defense, monsters that were smaller and larger than it as well.
It possessed no attribute that was exceptionally high and was a jack of all trades, which was good for Reign as such a monster was a perfect guard at this time. The monster could catch the faster amongst the demons, could tank attacks, and deal devastating damage to the demons and it was able to both block and dodge attacks thanks to its size.
Still, that also posed a problem as injuries were piling up. The demons knew that even if they were to lose this battle, killing Reign would deal a heavy blow to the humans, so they made it their goal to end his life.