Speak with
Senir

Take

and

from the chests

There are 4 portals, follow the directions to find portals. Near portal put on

and use

Stand in same place, till You get message to go for the next portal. Bring potions because You will loose many HP.

First portal located near: Ashmor Demon Ptl.
Second portal located near: Ashmor Castle
Third portal located near: Witchwood
Final portal located near: Graveyard
After sealing all 4 portals go back to
Senir to finish the quest.