Fire Proliferation

Firestorm is intensely shit at spreading a powerful Ignite. If you want a powerful Ignite build, you'd have to swap out Firestorm for either Flameblast or Discharge. Discharge is a bit of a high-maintenance build, whereas Flameblast is pretty simple.

That said, if you're only looking to trigger Celestial Punishment's 25% Increased Damage, then 5-10% Chance to Ignite is all you really need. Firestorm might not Ignite for a lot of Damage, but it spams Hits like there's no tomorrow. The Ignite doesn't have to be powerful to trigger CP. :P

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Nasreth wrote:

flameblast is good for ignite damage. socket with increased chance to ignite and elemental proliferation and focus on fire/elemental damage.

granted, you'll generally kill stuff with the flameblast or the burn alone so dealing damage after the ignite is generally unnecessary.

^This is what I was getting at, too. Applying a strong Ignite requires a strong Hit, which means you might as well make that Ignite your main focus - the Firestorms would be a bit redundant.

Another reason is simply that Celestial Punishment isn't that strong. It's a nice bonus if you're already Igniting, but 25% Increased Damage (which is additive with all other sources of Increased Damage you already have!) isn't worth using an entirely separate Skill for.


It also triggers off Shock though. On my Firestormer, I really like using Vaal Lightning Trap with Increased Duration to apply Shocked Ground to everything (50% Increased Damage Taken), and it triggers CP too.
Being a Damage Taken modifier, it applies on the defender-side and is thus multiplicative with your Damage multipliers. Pretty sweet!