Ur's healing buff
This buff heals too much too fast, he heals with almost every hit and concidering that me and my party hit for 20-30 and our pets for 20-25 the fight just becomes a long waste of time, after 10 min the boss ended up at full health and all that was left was to wait for him to finish off our pets.
In my opinion it would be best to change the healing done by the buff from 50 to 25, thus giving a higher chance for lower players to be able to beat him.