Herald of Ash aura for Spell caster?

I am a bit confused by the wording of converting Physical damage to Fire. If I am using fire brand and it's a spell casting, does it mean I should get +Physical to spell damage to maximize HoA?

If I don't plan on having any Physical damage to spell, is it a waste to use Anger?

What about Added Fire damage support? It has something about converting Physical to Fire too.

I assume you are using Armageddon Brand (https://www.poewiki.net/wiki/Armageddon_Brand).

Easy answers first:
Anger adds a flat amount of fire damage to your skills (https://www.poewiki.net/wiki/Anger), and so it will be a good boost to your damage. Anger has nothing to do with Physical damage.

The 'Gain 15% of your Physical Damage as Extra Fire Damage' mod will do what it says it will do: however much Physical damage your skills do, it will take 15% of that, convert it to Fire damage, and scale it using your investment into Fire damage (for example, 'x% increased Fire Damage' nodes on your tree). If you have very small amounts of Physical Damage (or none at all as is the case with Armageddon Brand by default), it will be a very small damage increase.

Since Armageddon Brand is fire damage only, the only thing that Herald of Ash does for it is the 12% More Skill Fire Damage (https://www.poewiki.net/wiki/Herald_of_Ash), and the extra explosions afterwards.

Added Fire Damage Support (https://www.poewiki.net/wiki/Added_Fire_Damage_Support) will also do nothing for Armageddon Brand.

Other answers:
From what I have seen, Armageddon Brand clears packs of monsters pretty well, and you don't really need the explosions that HoA provides. This means it's only giving you 12% More damage for 25% of your mana. It's likely that there are other auras that would give you more. It's not worth getting +Physical to spells, since any +Fire to spells would be strictly superior as the +Physical won't get scaled by most of your investment. (In other words, you should re-evaluate your thinking: it's not about making HoA better, it's about replacing it with something that just IS better.)

Since the value HoA provides is quite low damage-wise, I would recommend testing your clear without it and seeing if you like it. However, if you enjoy the explosions from HoA, then use it :) It's a game after all, and games are about having fun.


In conclusion:
Anger is Good
Added Fire Support is Bad
HoA is not great, but if you enjoy the explosions then use it

If you need clarification or have any other questions, just ask :)

Love your answers! Thanks.

I find it hard to scale Fire damage through Aura. I like Zealot. I can't run both Zealot and Anger yet. I am already running Skitterbot.

I wonder maybe a low level Precision's critical chance adds more? I think 12% more damage from HoA is okay so far. I don't have huge mana problem yet.