The metal element is definitely out of the question; it's scarce here and can't be used to nurture anything. It can only be used for sneak attacks with the Six Meridian Divine Sword.

Water and fire aren't much use either. The earth element could be used to set up some traps, but those traps need to be hidden.

Got it, vines. That's a good idea. They can grow quickly and entangle them when they land.

But this is a massive project, and I can't do it alone.