Talos-II is the kind of place that punishes sloppy upgrades. You throw XP at a shiny new Operator, run a few missions, and then the enemies jump a tier and your "investment" suddenly looks like a mistake. If you're trying to keep your roster lean, it helps to know who's pulling real weight and who's just taking up mats. Some folks even use Arknights endfield boosting to catch up after a bad build detour, but even then you still want to spend smart once you're back on track.

S-Tier Priorities

If you land Laevatain, build her and don't overthink it. Heat teams love her for the wide coverage and the way she clears packs before they become a problem. Last Rite is the Cryo answer when you need a clean burst window; bosses don't get to "settle in" when she's online. Pogranichnik is the physical standout because vulnerability isn't flashy, it's just brutal—your whole squad hits harder, all the time. Ardelia keeps runs from collapsing with steady heals plus utility that actually matters in rough encounters. And Antal is the funny one: not top rarity, still top impact, because that Focus boost turns okay damage into "why did that melt so fast" damage.

A-Tier Workhorses

This is where most real accounts live day to day. Endministrator is a pleasant surprise, and it's nice not having the story lead feel like dead weight. Yvonne is a clean Cryo DPS option when you don't have the premium burst, and Avywenna gives Electric teams a reliable backbone without needing perfect supports. Catcher is the defensive pick you'll feel immediately—less panic, fewer resets. Lifeng and Perlica are great for players who like control and team utility; they're not always the star, but they make fights smoother. Wulfgard is also worth mentioning because early free Heat damage that stays relevant is rare. Ember and Gilberta sit in that "plug them in and it works" slot, especially mid-game.

B- and C-Tier Reality Check

B-tier units aren't useless, they're just easy to replace. Chen Qianyu feels fast and responsive, but the lack of AoE shows up the moment waves get dense. Snowshine has defensive value, yet it's often too specific to justify first-choice investment. Akekuri can act like a budget battery, which is handy when your roster's thin. Alesh, Estella, and Xaihi can fit Cryo plans, but they usually need more resources than they return. C-tier is where you stop and ask, "Am I doing this for fun or for progress?" Fluorite's hybrid angle doesn't pay off, Arclight can feel awkward unless the whole team props them up, and Da Pan tends to hit like they're always a step behind. If you're short on mats, it's often better to save, or grab quick help like currency and upgrade materials from U4GM so your core squad powers through the next spike without spreading resources too thin.