The Catspeak amulet (e) is helpful for finding Bob the Cat. I'm sure the quest can be completed without one, though you would just be making it harder on yourself than it needs to be.
Regarding the final battle:
The final battle is actually four separate fights. You can leave in between the battles to bank and start where you left off when you return, and individually the battles are pretty easy.
Regarding the rewards:
The new barrows brother is neat. His tomb is in a new room which is an extension of Verac's crypt. He attacks with melee and he switches protection prayers when you damage him, similar to TDs. Like the other brothers he's not particularly dangerous and can be killed without much trouble.
The new bolts/arrows look pretty nice. I made some dragon bane bolts and tested them on black dragons. It seemed like I was hitting 400+ more often than not, and I even saw a few in the low 500s. And that's at 90 range with extremes & no prayers. I haven't tried the arrows yet, but the dark bow spec with bane arrows could turn out to be pretty good and a heck of a lot more affordable than other special attacks.
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