I was looking into the immovable rod (as an option for pinning someone), and there were no specifics for if it could break or how to do it.
The immovable rod has a weight limit of 8,000 pounds before it deactivates and falls to the ground, or it can be moved up to 10 feet after succeeding on a DC 30 Strength Check.
Are there ways to break the immovable rod?
Best Answer
Magic items can be destroyed unless specified otherwise
The rules for magic items do not say that they can't be destroyed. In fact, they specify under the Magic Item Resilience heading:
This implies that they at least can be damaged. Now, how much damage would need to be dealt to destroy the rod will be up to the GM. One source he/she could draw on is the Object Hit Points rules in the Dungeon Master's Guide.
Antimagic
If the goal is to destroy a magic item, an antimagic field will remove the damage resistance as: