Take the Sealed Venom Container to Mux Manascrambler in Gadgetzan.
You must be quite brave to have stuck around after that. That or I've piqued your interest with the piece of armor I gave you. There is more from where that came from, if you're still interested in aiding me.
The venom samples you collected are for an acquaintance of mine, Mux Manascrambler, an engineer with an interest in the supernatural. His latest project consists of a device that allows you to communicate with the dead! My last hope is to contact Anthion and find out more about my situation.