[andrewas]

Outsiders are anything that isnt from this plane and/or uses energy from other planes to survive. High level monks, aasimon, daemons, elementals, and so on and so forth.

And drowned dead are definatley supposed to be undead, as I was able to turn them in IWD1. They should be vulnerable to the club of disruption. You can turn on combat roll display in the feedback menu, this will show you if they are making saves or not.

The BG2 Mace of Disruptions is awesome versus high level undead like vampirces, liches and the like. I suspect the Clud of Disruption will be the same.