As a Djinn, Ugo has a giant body with equal strength. He can easily defeat large groups of enemies and even an army after materialized in the current world. Ugo was able to defeat even Judar, who himself was a Magi and had strong Ice and Lightning Magic. He destroyed Judar's Borg with his sheer strength.

What happened to Judar?

Right after Judar was born, his parents, along with everyone else in his village, were immediately killed by Al-Thamen. ... Shortly after the founding of the Kou Empire, he was taken there by Al-Thamen and became the empire's Oracle and High Priest.

What happens to Ugo in magi?

He is not seen again until he is summoned by Aladdin to save him from Judal's lightning magic. He quickly begins his attack on the other magi and though it appears he had a hard time at first; he ultimately defeats Judal. As Ugo is about to deal the final blow, Judal he is saved by Kougyoku Ren and Ka Koubun.