Undead Armament (5e Feat)
From D&D Wiki
You may take the arm bones of a skeleton and attach them to yourself as a bonus action.
- You can now wield weapons with the light property in your extra hands
- you have advantage on climbing and grappling checks
- you may detach the extra arms at any time as a bonus action losing all the above benefits
- You can not use your extra arms unless you are not wearing body armor or you make modifications to your armor to accommodate for the additional arms