Welcome to the board Silaya!!!
Few items in this game are needed beyond the dungeons in which they are found. The Mask is one - found in Serpent Temple, needed in S.Castle. Staff of Death, found in Skull Castle, needed at Shrine of Anephas/Temple of Isis and also useful in Cet's Pyramid!
Boogres Brew can get you into the Stout Mines but so does the writ. Let me not forget the Mavin Sword, found in Dragon Spire and needed in Cet's Pyramid.
Can anyone think of other items found in one dungeon and needed in another?
Wyv