And we got it now - incredibly late in the build process.
Why so late?
Because our testers didn't test it.
You see, it's a pretty lousy spell - it's one of those spells that's either too powerful to be balanced, or too sucky to use. We chose the latter. So, because it was a bad spell, the testers didn't test with it.
Um, guys - this is your JOB. You're SUPPOSED to test everything, even if it's not fun. That's why we're paying you. Understand?
Apparently, the only reason it got found was someone left a different project to join ours. And they gave him a high-level character to join a game in progress, and he saw the spell, and tried it out, because he didn't know it sucked. And it broke.
Note to self: when running game company, hire own testers.