When using weapons with Incandescent or weopons like One Thousand Voices or Polaris Lance and creating an ignition, the kills caused by the ignitions do not count towards roaring flames.
-
Obviously this needs fixed but in the meantime try maybe using Phoenix Cradle (I know, why would that help), sometimes something that alters a subclasses abilities can circumvent the spaghetti code lol. Once in a blue moon you’ll find a workaround. Usually not, but worth a shot