I also, was this talent. Normally, I would instruct your attention, to what was called the soul forge. The location of forges, do not lose traits as time passes, instead they continue, to gain in vigor. It is a flaw in the system similar to unholy strength.
The main skills tree, is different than other editions. It is based around artifacts, that add a named item to inventory. These make up all the possible maps, before use of abyss. An accurate mapping of the ocean, from radar study. In many cases, this would add a basic attribute, not alter an ability from the skill tree.
Basic spells are bone spear, corpse explosion, and re-animate skeleton, and skeleton mage. These are basic +1 to skills cast, from a knights ranking, that make playing a necromancer, far different than a sorceress.
In later examples, the official quest, is only from of quest-line, they can not be added to, or otherwise changed. The quest, is the solution to the map cartography. This is how artifacts worked fitting the war. Later, the ability to equip equipment to hired adventurers, became available, but quests are the same.