where can i find the protection from undead scroll?
will this work against Kangaxx, and when do i use it?

Various sources.
Ribald in the Adventurer's Mart, and the woman selling spells near the back left of the same shop. Probably some temples as well.

It certainly does work against Kangaxx.

Apparently you shouldn't use it until he changes form (into demi lich I think).

Every time he goes into Demi lich form he kills my group, one by one, not sure which spell he uses but i don't think its imprisonment! how do i stop that?

<font color = "lightgreen">He is using Imprisonment (technically, the spell should be Trap the Soul, but it doesn't exist in this game); you could try Spell Trap, Spell Immunity: Abjuration, Protection from Magic scroll, etc. Or you could just leave him alone. [img]tongue.gif[/img] </font>