[Shovah32]

I would avoid giving bloodthorns or hellswords to the assasins, the lifedrain nerf means you should have better things to spend slaves on. For your slayers try:
boots of giant strength
bearclaw talisman
amulet of luck/antimagic/ring of the warrior/burning pearl depending on situation and avaliable mages/gems.

You will end up with a slayer who has 2, strongly poisoned daggers and a strength of 25(+ the daggers damage) and either luck/great mr/very high attack