Fixed accordingly to 'advanceto' conventions.

data/campaigns/Sceptre_of_Fire/units/Dwarvish_Arcanister.cfg

@@ -16,6 +16,7 @@
     alignment=neutral
     cost=50
     usage=fighter
+    advanceto=null
     experience=100
     {AMLA_TOUGH 3}
     unit_description= _ "The most powerful of all the runecrafters, the Dwarvish Arcanister destroys wounded enemies almost instantly, and rarely fails to cause a wound when that is his intent. His skill in runecrafting is unrivaled, and the glyphs he carves into his weapons and armor deflect the blows of his enemies."

data/campaigns/Sceptre_of_Fire/units/Dwarvish_Runemaster.cfg

@@ -17,6 +17,7 @@
     cost=50
     usage=fighter
     experience=100
+    advanceto=null
     {AMLA_TOUGH 3}
     unit_description= _ "Except for those with almost supernatural skill, the highest rank a runecrafter can rise to is that of the Dwarvish Runemaster. Striking blows nearly as powerful as those of the best warriors, they would be fearsome without their craft, but with it they are also nigh on invincible, since their runes cause the physical blows of their enemies to deal less damage than would be expected."
     {DEFENSE_ANIM "units/dwarves/runemasteralt-defend.png" "units/dwarves/runemasteralt.png" {SOUND_LIST:DWARF_HIT} }