What if the base damage remained line-of-sight dependent, but the status detonation ignored terrain? Would feel nicer since Dark Verse and Tragedy are casted separately, thus lines-of-sight certainly have changed in the duration of casting. Status detonation ignoring line-of-sight could then be used to more support the damage of teammates rather than your own.
There is the idea of line-of-sight from every Wordwarden or every Paragrimm, but that sounds rough to implement.