disc actually has no spells that don't proc atonement when they deal damage.
shadow mend completely makes sense since shadow mend is a spell that doesn't deal spell damage, but instead is a burning rush type effect.
all other sources of spell damage (besides mark of the hidden satyr) in wow procs atonement, why would it make sense for this new AoE DPS spell to cause zero atonement hps? why would this make sense when AoE DPS trinkets proc atonement?
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these spells are also terrible so......????
the fact that these spells can hit multiple targets makes them impossible to balance. either they're terrible because they don't deal enough damage to be worthwhile to spend mana/gcd's on vs any other spell in the disc toolkit, or they break disc output on bosses with multiple targets.
don't you see now why it's impossible to balance aoe dps on disc priest? that's why blizzard hasn't tried.
https://clips.twitch.tv/GrotesqueFrozenOilAsianGlow related twitch clip to demonstrate how op aoe dps can be on disc.