UFO

UFO sits one rarity step past Bomber, at 1 in 478 million for another Tier S attacker in the secret band. There is no Huge variant and no special role gimmick, just more raw damage for accounts that have already cleared the cheaper secrets and still want the next damage bracket. By the time your stack consistently lands secret-tier pulls, UFO is the obvious next target.

Equip UFO the moment it drops, because nothing cheaper out-fights it on raw stats. The honest comparison is to Bomber: same role, similar pull-window, just a step rarer, and UFO out-paces Bomber on pure damage in active play. After UFO joins the loadout, Bomber moves over to a secondary slot rather than getting stored, since both are Tier S and your team rarely benches an active secret attacker.

Until your luck stack supports billion-to-one math comfortably, UFO is the practical ceiling for active damage on most secret-deep accounts. By the time Blackhole or Ember finally lands and pushes the team further, UFO has paid for itself in zone clears many times over. Treat it as a milestone in its own right rather than just a stepping stone.