Coldeon was known as the God of War mainly because his powerful attacks were able to destroy many enemy soldiers in large numbers. The reason behind that was his inherent special ability that allowed him to increase the number of attacks he was able to release at a time.
He just needed to spend three times the amount of mana needed to cast a specific spell at once and that would allow him to release five attacks of the same power level. This skill was truly very powerful. Anyone having this skill would almost be undefeated at the same power level.
Even though Coldeon was known as a war hero that was only limited to his own nation. Others did not consider him to be a top tier powerhouse even with his broken skill. There were two main reasons behind that.