How about interacting with a table and getting ability to break up and pick up one of the legs or flat surface.
Damage increases with the quality.
At the risk of stating the completely obvious, damage increases with quality
for weapons because weapons are designed to do damage. By definition, a high-quality weapon is good at doing damage.
A high-quality table leg is a different story.
You combine the sea urchin and the stick to create a sea urchin mace. You are now no longer unarmed.
That's stupid.
That's not constructive.
I'll be more specific, then.
Sea urchins (1) don't weigh very much and (2) break easily. The idea of tying one to a stick as a weapon is obviously based on the assumption that anything "spiky" can be put on a stick to make a mace. Maces don't work like that. Sea urchins don't work like that. Please do a little bit of research. I know it's only an example, but think about what it demonstrates. If you illustrate your feature with janky, cheesy, implausible things like the Sea Urchin Onna Stick Mace, you show that it's good for making the game suck more.
Don't tell us the Promised Land is flowing with milk and vomit, and then say "vomit is just an example, it could flow with other things".