Your arsonist switch gear for early game might be incorrect.
Cube
Cube
Necromancer Shields
'Nef'
Runeword Level: 13
+1 to Necromancer Skill Levels
5% Movement Speed
+2 Damage
+5 to Dexterity
+10 to Vitality
(4 to 7)% Gold Find
gives +necro skills, not all skills, so dark power shouldn't be boosted by it. I could be wrong, but it shouldn't work that way since dark power isn't a necro skill. I'm not sure how high of a rune nihlathak can drop in early game hatred, but if he goes up to Ber, you can add
Goddess
in there.