My thought would be that the appropriate sort of effect be achived with a biological method, not some sort of non-line-of-sight magic arrow stuff. The obvious ways to do this are to use really nasty toxins or biologically active agents (fungus or bacteria) that would cause the target to become dead, or eat his armor, break down his defensive magic, or do other nasty things.
If you can breed this into your guardian plants it works even better. The hostile vegetation for Gerrold's "Cthror" books would seem approriate.
Kevin
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