So, with the FFIII event (hopefully) around the corner, Cloud of Darkness is going to receive her 6* upgrade, and I've got it ready for awakening as soon as it's available.

But while it gets a very high ATK stat, it only learns a new offensive ability, and at level 100. According to the wiki here on Reddit, it's

210% ST 1 Hit Dark Physical Attack Ignore 25% DEF

If I understood the ignore-defense formula correctly, the effective damage should be x2.8, and with a colossal MP cost of 45 for what it is.

So, I was wondering, will there be any point in using that ability over Barrage, unless the enemy is weak to Dark? Because compared to what other 6* attackers get at level 100, it seems pretty underwhelming. Maybe there's something I'm missing here?Are you supposed to make long Dark elemental chains (somehow) and use CoD's one at the end?

(And yes, I'm aware that Lightning's Crushing Blow deals even less damage for that cost, but she's designed for AoE damage and that ability is her strongest single target attack and has incredibly high chaining potential, so it's somewhat justified. Also Dual Wield.)