Stormy

Stormy pushes past Ninja into boss-killer territory. At 1 in 3.07 million and Tier S, it is built to delete high-HP targets rather than trade blows, which makes it the prismatic to chase once you have Ninja covering ordinary clears and need an answer for fights that drag.

The rarity is a real jump from Ninja, so only commit when your stack can absorb it. After Lucky is in place and your prismatic luck window is humming, Stormy becomes the reasonable next target. Until that setup is real, the pull rate makes Stormy a frustrating session rather than a rewarding one, even with the Tier S payoff waiting at the end of the grind.

Keep Stormy for the fights where burst is not enough and you need something that ends bosses before they become a problem. By the time you reach the transcendent tier with Bucky or Pokey, Stormy still earns its slot for the same reason: boss kills do not get redundant, and a dedicated burst-only attacker like Ninja sometimes leaves a long tail that costs you a reset.