Good afternoon,
I just slaved away at a Raiding Dummy for 30 minutes to run the math. Here are my findings:
FINDINGS:
Internal Combustion (Warlock Second Row Talent) is NOT impacted by the increased Immolate Damage from Combusting Engine Conduit.
Internal Combustion is NOT impacted by increased Immolate Damage from the Roaring Blaze talent (regardless of whether the Roaring Blaze buff is active or not).
Combusting Engine’s increased Immolate Damage IS impacted by Roaring Blaze.
CONCLUSION:
There is a bug wherein Internal Combustion talent is not accounting for Immolate’s increased damage with Combusting Engine conduit nor Roaring Blaze talent.
Roaring Blaze during Legion (which is literally equivalent to the Combustion Engine conduit now) and Internal Combustion used to interact in Legion, so Blizzard already has the data to ensure these modifiers apply. Please fix.
Thank you