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I'm ticking off incomplete AQ and the website lists Melvire of Xanthippe offering an assorted_poisons AQ.

ask Melvire about quests
You ask Melvire about 'quests'.
Melvire tells you 'So, you are a thief, eh? So, you KILL things! (Melvire chuckles dryly '
Melvire tells you 'for a minute, ending in a coughing fit. ) I love it when things die, '
Melvire tells you 'especially when they die by POISON! Also, I love thieves for all their '
Melvire tells you 'killing! (Melvire suddenly falls silent, and stares of into space. You '
Melvire tells you 'wonder if he is sane. ) Perhaps you come here seeking assorted_poisons? '

ask Melvire about assorted_poisons
You ask Melvire about 'assorted_poisons'.
Melvire tells you 'Sadly, you aren't eligible for this quest because you must first complete 'most_evil_thief'.'
Melvire tells you 'Sorry, I don't know anything about that.'

ask Melvire about most_evil_thief
You ask Melvire about 'most_evil_thief'.
Melvire tells you 'Sorry, I don't know anything about that.'

Some clue as to where to go next would be appreciated!

A thief vampire tells you 'Sorry, I don't know anything about that.'

An enslaved dwarven thief tells you 'Sorry, I don't know anything about that.'