Retributive Strike Spell?

[kalasulmar]

I seem to remember seeing a spell that replicated a retributive strike from a staff but can't remember where it came from. Anybody remember this, or am I making stuff up?

[BWR]

Mycontil's Last Resort.
3e version in FR's Shining South.

[kalasulmar]

You, sir, are a gentleman and a scholar.