Hi, i want to add a subclass feature that lets the player pick two weapons to be able to use weapon mastery with, and change them every long rest, but i only find under the modifier section the weapon mastery feature which obliges me to pick a single specific weapon. So am i doomed to make a class option and list one modifier for every single weapon in the list there? or is there a quicker way?

I actually wanted to give it to hex warrior ability from hexblade, but i suppose there is no way to make the character have automatically weapon mastery with the pact weapon or hex weapon he's currently bound with... 

Bumping this thread. I want to do the same for the Kensei monk.

I’m trying to do the same thing to add mastery to Bloodhunters. They seriously couldn’t have a “Choose Weapon Mastery” option?

The way modifiers work is so convoluted and painful.

I see there are a lot of implementation lacking in the home-brew builder right now, we probably have to wait until they decide to properly code more stuff. Anyway weapon mastery is just a description in the action section, you just need to remind that while looking at the character sheet