am not sure if the affix:
(100 to 150)% Chance to Ignite on Hit with Fire Skills
from the Calamity unique affects the Fissure of Wrath node from Chthonic Fissure:
Fissure Spell Damage per 2% Ignite Chance: +1
I would think it doesn’t work and Chance to Ignite on Hit with Fire Skills is not the same as Ignite Chance but someone with more experience might know better. Maybe the game first calculate the total ignite chance from all sources and then skill nodes like this applies?