Get yourself a
http://wiki.project1999.com/Poison_Wind_Censer, and melee low blue mobs after casting walking sleep and your strongest damage over time spell. Commonly sold for 500-800 plat. You can make these money easily enough killing hermit in South Karana zone, or just hit money making guides in p99 wiki section.
Just try and hit lvl 24, after that you get a decent poison DoT, regen and cannibalize. It gets so much easier then.