one tactic to kill the vampire lord: use a weapon with a 'kill undead' improvement. at some point it will indeed kill of the Vampire Lord before his whole health bar runs out.
to advance I sometime import another character as fodder. I managed to get around many difficult Bosses that way.
Also I actually developing 4 characters at the moment (Ranger, Cleric, Dark Elf and Warrior) all between lvl 13 - 21 now. I let them help eachother by purchasing appropiate armour and weapons. As I found that certain Characters find/stumble upon different options. They can be interchanged and left behind without actually loosing the original's saved settings.. I have managed to build up my Cleric to level 19 before act IV !!
It seems that the les time you take to kill a NPC or an enemy the more experience points you receive! So build up that arsenal of weapons I tell ya!
tactics page? 
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