Some things that I think could be added:
-An “improved token of unding” that has like 10 uses insted of beeing a one of
-A better bow, maybe that insta kills or does damage in the hundreds
-An object similar to the acceleration wand or the watch of flowing time
-A duplicator that works similar to the calculator one but using infinity ingots as fuel

• Definitely will do improved undying token.
• Probably won't add bow, as base Avaritia author has stated he will make the bow work like the sword. (Maybe only in 1.13+ not sure)
• Honestly wouldn't be a bad idea just to add an avaritia recipe for both of those, and possibly remove the normal crafting recipe. Probably won't add an item myself directly though.
• Have a block duplicator planned already (low on my priority list but will eventually get to it). However, it will probably just consume like 1 or 2 trillion RF, and need a full stack of whatever is being duplicated in its inventory.