Amplify Curse talent does not increase Curse of Agony damage by 50% as expected but only by ~20% (Warlock)

[Hambi]

The Amplify Curse talent/spell (Affliction tree) is supposed to increase the effect of the next Curse of Agony by 50%. However, when tested, the total damage increase is only approximately 21.7%, not 50%. This suggests the amplification may be applying only to the base damage of the spell (excluding spell power bonuses).

Based on the spell tooltip ("Increases the effect of your next Curse of Doom or Curse of Agony by 50%"), I expected a full 50% increase on the total damage output.

• Total damage without Amplify Curse: 3588
• Total damage with Amplify Curse: 4368
• Actual increase: 780 (21.7%)
• Expected increase (50% of 3588): 1794, for a total of 5382

This was tested in a controlled environment (on a dummy allowing full DoT duration). No other modifiers were active that would differ between tests. My spell power and talents may affect the numbers, but the percentage increase should still be 50% if working correctly.

Steps to Reproduce:

1. Ensure you have the Amplify Curse talent and Curse of Agony spell (Rank 7).
2. Cast Curse of Agony on the target without using Amplify Curse first. Record the total damage dealt over the full duration (e.g., via combat log or addon like Details!/Recount).
3. Wait for cooldowns and debuffs to reset.
4. Cast Amplify Curse on yourself, then immediately cast Curse of Agony on the same target. Record the total damage dealt over the full duration.
5. Compare the totals: the amplified version should deal 50% more than the non-amplified version.

Found similar bug reported here - https://us.forums.blizzard.com/en/wow/t/amplify-curse-is-incorrect/2062707

Game character: Hambi

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[Dromok]

perfect report, respect