Question regarding damage conversion and skill visuals

[tqFan]

If I had to guess, either an oversight, Brimstone’s shards specifically cannot be altered by a skill modifier

Might be true because it is the last node of a skill line.

Not sure if it adds anything to the topic (because I cannot really tell the difference but)

Secondary Skill Modifiers

There was a myth at some point that things like Brimstone and Vile Eruption are the same. They aren’t, projectile fragmentation is a default property of projectile skills and is therefore fully supported by skill modifiers.

Does it mean that Brimstone cannot be altered (i.e. converted) by skill modifier and Vile Eruption can?