In my opinion ultra gramiel is one of the better designed ultras in this game based on the fight requirements and it's actual rewards
The requirements for this fight itself is basically non existent if you are a newbie you just can get stonecrusher + basic enchantments like fighter and you need nothing else and you would get rewarded not based on your forge but completely based of your skill that's not something I could say on most other ultras if we speak about let's say nulgath who is really easy , the DPS must have the best in slot to make the fight fast and easy with gramiel on the other hand you only need 4 players to do everything perfectly and you win simple st that but if you wanted something challenging (there was teams that includes shaman and lr which I sadly don't know if it still works after lr nerf someone confirm please) ، and finally to speak about the rewards of the fight I must say they are some of the best in the entire game and not too grindy to you only need the ultra itself for the most important things in the shop and even for the hollowborn vindicator class , the shop itself has too many good stuff like a 51% weapon a 30% all tags pet like Polly Roger and more good stuff , the fight itself intensifies the importance of cooperating with other players and learning the most important mechanic in ultras which is taunting , I'm honestly glad that the usurper fight also had a lot of creative design and also appropriate reward for it's effert too and I really look forward to seeing future designs , ok for real tho have you seen the absolute fiend that's the moglin in green dragon lair in infinity if that's the level of challenge there then I dread the day ultras comes to infinity lol