The cave with the necromancer Naberius is in the top left (2.6) of
this map. The cave itself looks like
this.
Laiken is the necromancer who moved into the battle tower on sentinel island, who you need to defeat to become a full dragon knight. You get access to the island after you defeat Amdusias.
You need to find
4 parchments in Broken Vally, and have them translated by Zixzax the imp (who is outside Maxos temple), in order to get the password for the teleporter by the chapel waypoint (and another near Lovis' tower).
BTW, your first encounter on sentinel island you can mindread to go up a level, so the higher level you are (I made it to level 18 in the fjords) the more of an experience bonus that will be. You don't need to get to a high level, but it would be better if you got to a new level before entering, to get a full level bonus.
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