Killing of Mage and Necromancer ??

[zhaozhilong]

1. In the Great Forest -, the is a Black Tower that was fenced up with the boundary similar to the one in the Magic Range (Arlania).

Will it make any difference if I were to talk / kill the Mage 1st and only then do the Magic Range quest ?

2. In the undead zone (not sure Grey wasteland or the other), I found out only much later after killing the witch (Zelbretta or something i think) while doing the Elf quest that there the necromancer in the tower is somehow related to the quest. Then is it possible to "not kill" the witch ?

Tqs in advance