Without “arcane flames”: Ok, with zero ignite chance, and deleveled fireball so it only hits one target, with no chance of piercing through to others, everything sems to be working as intended. Ignite procs on 25% of hits on the hit target only, according to fireball description.
Now with arcane flames:
“Your next fire ability that hits an enemy ignites additional enemies neraby. This effect has 8 seconds cooldown. This effect can ignite the enemy you hit unless it is killed by the hit”
When adding full five levels of “arcane flames”, it does indeed procc sometimes versus real enemies. It seems it proccs in priximity to me, not the target hit. Also, hitting a trget outside of range seems to put it on the 8s cooldown. Basically, any fireball hit seems to put arcane flamesl on cooldown, regardless if it had anything to trigger on in proximity to me. Unless the enemis have some stat that reduces procc chance, I think that is what is going on. Is this as intended?
It seem rather futile that it triggers when igniting zero enemies, putting it on 8s cooldown. The effect is that it basically never triggers.
Edit: I am not 100% sure I have mapped out exactly how taracane flames and fireball interacts. I at least know that it proccs much muss less often than the ability text led me to believe.