Bartender
From HGWiki
Sells all manner of useful (and useless) beverages and magical potions, for low level characters Avat's Unending Cosmic Suicider gives a very handy Stoneskin effect that limits melee damage until it runs out.
The Bartender is the person you need to speak to if you want to use the Proxy Characters system allowing merging of low level accomplishments to existing high level characters that did not obtain them during their original adventures.