How good of a weapon is a Shaolin spade? Because I saw a page about it that said that it was originally just a *spade*, and I just thought of your improvisatory weapons posts.
That might not be best way to think about it.
Shovels and similar tools are already pretty solid choices for improvised weapons. You have a blade on one end of a pole (or a grip, in the case of something like a trowel.) While they’re not designed for use on people, they are designed to drive a lot of force into an object (the soil.) At that point, applying that force into an opponent isn’t much of a stretch. You’re doing what it’s designed to do, just on “an unapproved target.”
The Monk Spade or Crescent Moon Spade is, basically, an augmented staff. The hooked blade would function as a defensive tool, allowing for some parrying, while the flat blade would function as a striking tool.
When we’re talking about improvised weapons, we mean picking an object in your environment and repurposing it as a weapon. In the case of the Monk Spade, someone looked at the shovels used by Taoist or Buddhist monks (I’ve seen it attributed to both groups) and decided to make a weapon based off of that design. At that point it’s no longer an improvised weapon; it is a weapon.
How good is it? As far as I can tell, historically these were used by traveling monks. The overall design is sound, and in the hands of a trained martial artist, they work, they’ll do their job. That’s what matters.
In a larger scale of, “how good is it in comparison to other weapons?” I don’t know. Like I said, it’s effectively an augmented staff. It was, apparently, well chosen for the situations it was used in, and it survives in the martial arts disciplines that trained with it. There’s no really value in saying, “but, this other weapon is so much better,” because if it consistently keeps the practitioner alive, while dealing with their foes, that’s the only metric that counts.