I will be DMing a DnD 5e adventure going from levels 1-12 starting this week. I am finishing up the personal quests for each character to help tie them in more into the adventure and give them something to look forward to for themselves. Most of the characters were pretty easy to work with, but I am somewhat stuck on the Armorer Artificer.

They have stated that their character's dream is to create a legendary item. Whether it be an artefact or just some other powerful magic item, doesn't matter too much to them. Handing out a powerful magic item as the final reward for a personal quest is very classical anyways, so I'd love to go with it.

The problem is, I can't think of anything fun to give an Armorer Artificer. They have lots of stuff to work with on their own, so neither a weapon nor an armor is really going to be of interest to them.

Have any of you homebrewed some fun items just for Armorer Artificers or have any idea for existing (be it Wizards stuff or homebrew) stuff to hand out? It should be a considerable reward for someone around level 10.