Added fire damage + increased weapon elemental damage bug?

I just had a test with heavy strike, added fire damage and lava lash and I think something is not working with this support gem.

Note that the only relevant passives are 2 x +10% elemantal weapon damage.

My listed physical damage with a 2h hammer (only physical) for heavy strike is 800-1138, with no support gems. I do not have fire dmg at all before adding supports.

I add the added fire damage support @ level 16 (35% added fire, no quality) and i have 297-423 added fire damage listed in riepilogue screen.

I imagined that i would have

1138 x 0.35 = 398

and then 398 +20% = 478 max added fire dmg

Instead i get 297-423 fire dmg and i cannot figure how this number is generated in nay way.

After all this osservations i added Lava lash passive and my fire dmg bumped to 323-459 from 297-423. How can be possible that +30% fire dmg is so low? I think something is not working properly.

Note that adding a "increased weapon elemental dmg" support, that says "more elemental dmg" i get correctly to 555-795

Any comment welcome

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Vipermagi wrote:

Damage Based On checks your Base Damage; with weapons, that is your weapon's Listed Damage.
Added Fire is Based on Physical, so the Fire damage also benefits from Physical damage increases.
All 'Increased' type modifiers are additive; the 20% WED and Lava Lash are added to your Strength bonus and probably a bunch of other passives. That's why they're not as strong as you'd hoped.

I guess this is true, but i think it's not really intuitive anyway.

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Vipermagi wrote:

All 'More' type modifiers are separate, multiplicative modifiers. That is why the WED support does work as you expected.

Working as intended though.

Ok this makes sense for sure, +% more fire dmaage is added at the end of buff chain and it's the most effective.

After i got lava lash with so minimal benefit i made another try, and swapped in a ring with +8% increased fire damage: the listed damage was increased more than expected, lava lash added 36 raw dmg and +8% fire damage added like 25 raw dmg, so i wonder how this is scaled ?_?


423 ----> 459 adding +30% increased fire dmg (lava lash)
459 ----> 48x adding +9% increased fire dmg (ring - i will fix the number when I come bak from work)