Do enemies Test attacks at 2d6 or 3d6?

I’m going to be running my first TinyD6 (Tiny Dungeon 2e) adventure, and I’ve run into a question that I can’t quite figure out:

Are monsters masters of their weapons? Example: Assassins. Are Assassins masters of their weapons? Just proficient? Bumbling incompetents?

I would think that they would be masters of one weapon, same as adventurers, but adventurers are also intended to be more heroic than your average NPC.

So, do enemies Test at 2d6 or 3d6 when not otherwise specified?