Gaudralek does not seem to have had a proc at first:
https://web.archive.org/web/20011016...html?item=6213
Based on the first comment on the page capture later in the year, I'd say it got its proc in the October upgrade patch:
Quote:
New Sword Stats By: bahut,
Posted @ Mon, Nov 19th 11:32 AM 2001
43dmg 38delay +50ac +100hps effect: 179 dd unresistable
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https://web.archive.org/web/20011226...html?item=6213