Building Your Unshakeable Core Team

The biggest trap new players fall into, and one I definitely stumbled into, is trying to level up every single agent they get. Resources are limited, especially early on. Spreading them thin means you end up with a dozen underpowered characters who can’t clear the story, let alone the endgame dungeons. The single most important “key” to progress is focusing on a core team of four, maybe five agents, and maxing them out first. But how do you choose who makes the cut? It’s not just about who has the highest rarity or the flashiest ultimate animation. You need to think in terms of roles, a concept the game doesn’t explicitly teach you but is absolutely vital for survival.

Think of it like a sports team. You wouldn’t field eleven strikers in soccer, right? You need defenders, midfielders, and a goalkeeper. SAG operates on a similar principle. After analyzing dozens of team comps from top-tier players and running my own stress tests, I’ve found that a balanced team for the 2025 meta almost always needs these three pillars: a Sustain Anchor, a Primary Damage Dealer (DPS), and a Support/Enabler. The fourth slot is your flex spot for a second DPS, a dedicated buffer/debuffer, or a specialist for a specific boss mechanic. The Sustain Anchor is your non-negotiable. This is your healer or shield-generator. Without one, even the most powerful DPS will get knocked out in later stages. Last season, I ignored this and tried to brute-force a dungeon with pure damage. My team was dead by the third wave. I swapped in a 4-star healer I’d neglected, and even though her damage was low, she kept my star attacker alive long enough to win. The game subtly teaches you this by making early bosses hit harder; that’s your cue that survival is key.

So, let’s get practical. How do you identify these roles in your current roster? Look beyond the “Combat” or “Support” label the game gives. Read the actual skills. A true Sustain Anchor will have a skill or ultimate that restores a significant percentage of HP to your entire team or provides a damage-absorbing shield. Your Primary DPS will have skills with high damage multipliers, often single-target for bosses or area-of-effect (AoE) for clearing groups of weaker enemies. The Support/Enabler is trickier but powerful. They might not heal or do big damage themselves, but they apply effects like “Increase all allies’ Attack by 30% for 2 turns” or “Reduce the enemy’s Defense.” I have a friend who pulled a legendary agent early on and was disappointed because his direct damage was mediocre. He almost benched him until he realized the agent’s ultimate made the entire team ignore 50% of the enemy’s defense for a round. Suddenly, his main DPS was hitting for double. That’s the power of a good enabler.

To help you visualize, here’s a breakdown of some common agent archetypes you might have and how they fit into the 2025 core team structure. Remember, rarity isn’t everything—a well-built 4-star with a clear role is infinitely better than a poorly built 5-star without one.

Once you’ve identified your core four, pour 80% of your upgrade materials—EXP chips, skill tomes, breakthrough orbs—into them. Ignore the temptation to level a new shiny agent for at least a week or two. This focus is what allows you to push further into the story, which unlocks better farming stages, which gives you more resources, creating a positive feedback loop. It’s the foundational “key” that every other strategy depends on.

Mastering the Two Real Game-Changing Mechanics

Alright, so you’ve got your focused team. You’re dealing damage and staying alive. But you hit another wall. You see players with similar power levels clearing content much faster or with higher scores. What’s their secret? It usually boils down to two mechanics that are easy to overlook but have an enormous impact on your performance: Elemental Affinity (Shield Breaking) and Action Order (Speed Tuning). The in-game tutorials mention these in passing, but they don’t stress just how critical they are for the 2025 endgame. Treating them as minor details is like knowing a car has a steering wheel but not realizing you need to turn it to go around corners.

Let’s break down Elemental Affinity first. Most enemies, especially bosses, have a visible shield bar of a specific color (representing an element: Fire, Ice, Lightning, etc.). This isn’t just extra health. When you hit an enemy with an attack of the matching element, you do significantly more damage to that shield bar. When you break it (reduce it to zero), you trigger a “Break” effect. This is a huge deal. The enemy gets stunned, skipping their next turn, takes a chunk of extra damage, and has a vulnerability debuff applied. I learned this the hard way on a weekly boss that had a strong Ice shield. I was using my powerful Fire DPS, and my damage was pathetic. I swapped to a weaker 4-star Ice agent I hadn’t used in ages, and just by matching the element, I was breaking the shield every other round, constantly interrupting the boss’s deadly attacks and winning easily. The official game community managers have emphasized in their 2024-2025 preview streams that boss and elite enemy designs will continue to heavily feature these shield mechanics to encourage strategic team building. So, how do you apply this? Don’t just build one “best” DPS. Try to have at least two reliable damage-dealers of different elements in your roster. Your flex slot in your core team is often where you swap in an agent specifically to break a key enemy’s shield. Check enemy details before a tough fight and adjust your team accordingly. It’s the difference between a ten-turn slog and a five-turn victory.

Now, let’s talk about Action Order, or what veteran players call “Speed Tuning.” This is a more advanced, but incredibly powerful, “key” to optimizing your runs. Every agent has a Speed stat. This determines who goes first, second, third, etc., in each wave of combat. It seems simple, but the order in which your team acts can make your combos work flawlessly or fail completely. The goal is to sequence your team’s turns for maximum effect. A classic example:

I keep getting new agents. Should I level them all up?

Absolutely not, that’s the fastest way to stall your progress. I made this exact mistake early on. Resources like EXP chips and upgrade materials are super limited, especially from levels 1-

Think of them as your main crew. You need a dedicated healer or shielder (your Sustain Anchor), your hardest hitter (Primary DPS), and someone to buff your team or debuff enemies (Support). The fourth is a flex spot. Ignore every other new agent until this core team is strong enough to farm the higher-level resource stages efficiently.

What’s more important, a 5-star agent or a good team role?

A good team role wins every time in the long run. A 5-star agent with flashy animations but no clear purpose (like a damage-dealer who doesn’t do as much damage as a dedicated 4-star) will hold you back. I have a friend who used a 4-star healer for months because her team-wide heal was reliable, while his 5-star “support” only did minor single-target healing.

Your team needs specific functions to survive: healing/shielding, damage, and support. Check an agent’s skills. Do they have a skill that heals the whole team? That’s a Sustain Anchor. Do they have one skill with a huge damage multiplier? That’s a DPS. Fill those roles first, even with 4-stars. You can always slot in a powerful 5-star later when you understand how they fit.

Why do I do no damage to some bosses even with my strongest attacker?

You’re probably ignoring the Elemental Affinity (shield breaking) system. Bosses and elite enemies in the 2025 meta have colored shield bars. If you attack with a non-matching element, you barely scratch the shield. But if you use the matching element, you break it fast, which stuns the boss and makes them take way more damage.

I learned this on a frost boss. My main Fire DPS was useless. I swapped in a weaker Ice agent I never used, broke the shield in two turns, and won easily. Before a tough fight, check the enemy’s element and use your flex team slot to bring an agent who can break that specific shield. It’s a total game-changer.

My team has good stats but I still lose. What am I missing?

You might be overlooking Action Order, or “Speed Tuning.” It’s not just about who has the biggest attack stat; it’s about who goes when. If your buffer goes after your damage dealer, the buff is wasted for that entire turn cycle. If your healer goes last, your team might die before they get a chance to act.

You want to sequence turns. For example, your Support/Enabler should go first to apply an attack buff. Then, your Primary DPS should go immediately after to use that buff on their big attack. Finally, your Sustain Anchor can go to heal up any damage taken. Look at the Speed stat on your gear and artifacts. Sometimes, using a piece with slightly lower attack but higher Speed on your buffer makes your whole team perform better.

How do I know which agents to use for the Sustain and Support roles?

Don’t just go by the game’s broad “Combat” or “Support” label. Read the actual skill descriptions. A true Sustain Anchor will have a skill or ultimate that says something like “Restores HP to all allies by 40%” or “Grants a shield equal to 20% of max HP to all allies.” That’s your keeper.

For a Support/Enabler, look for skills that affect your whole team’s stats (“Increases Critical Rate by 20%”) or weaken all enemies (“Reduces Defense by 30%”). These effects, even from a 4-star agent, will boost your main DPS’s damage more than adding another mediocre attacker. I prioritized a 4-star buffer over a 5-star sub-DPS, and my clear times dropped from 8-10 turns to 4-5 turns on most stages.