How Town Guardians' formation grid turns placement into probability

June 24, 2026

On the surface, the formation screen in Town Guardians is the calmest part of the game. Three rows — Tankers up top, Dealers in the middle, Supporters at the bottom — seven slots each, twenty-one in total. You drag your Successors into place. That’s it.

But that quiet screen is one of the most consequential systems we’ve built, because almost every choice you make there changes the probabilities that play out later, in the chaos of a live wave. This is a look at how a placement UI became a compounding math machine — and the design rules that keep it from feeling like homework.

Placement is permanent, and that’s the point

Two constraints shape everything else. First, every Successor you own must be placed — the board isn’t a subset of your roster, it’s all of it. Second, once a character is in a slot, you can’t pull them back out. You reorganize by moving, not by removing.

That permanence matters. It means the board is a single, whole thing you’re always tending, not a lineup you rebuild from scratch each run. Investment accumulates in place.

We currently ship one formation — the Standard three-line grid. Ten others are fully designed on paper (Vanguard, Glass Cannon, Elite Force, Elemental Resonance, and more), each with its own slot geometry, but they’re future updates. Shipping one formation well beat shipping eleven half-tuned ones.

Three ways a slot means something

A slot isn’t just a place to stand. Three synergy systems read the board:

Formation Leader — whoever sits in the first slot of a line projects a leader effect over that line, and it scales with their grade, from Normal up to Legend. Slot one is real estate.
Bond Synergy — some Successors share a story. Place two story-connected characters in adjacent slots and their bond activates. The reward for knowing the characters is mechanical, not just narrative.
Attribute Line Synergy — fill a line with a single element and effects trigger at the 2, 4, and 7-character thresholds. With six elements across three classes, that’s eighteen distinct line effects to discover and build toward.

None of these are numbers on a stat sheet you’d read once. They’re relationships between positions, which is what makes rearranging the board feel like solving something.

The part players don’t see: summon weight

Here’s where the formation stops being cosmetic. During a wave’s break-time, Successors get summoned into three temporary slots below the board — and which Successor shows up isn’t uniform. It’s weighted.

Every slot starts at a base summon weight of 100. Placing a character adds +10. And every five enhancement levels you pour into a slot adds another +5 to that slot’s weight. Enhancing a slot costs Gold and Starlight Tears and hands back a random stat bonus — but the quieter effect is that you’re tilting the summon pool toward the character standing there.

So the player who heavily upgrades one slot isn’t just making that unit stronger. They’re making that unit show up more often when it counts. The investment reads as a stat boost and acts as a probability shift. That double meaning is the whole design.

Guidance of Starlight: the board that moves the gacha

Zoom out one more level. Add up every slot’s enhancement level across the entire formation, and that sum feeds a system we call Guidance of Starlight — a direct bonus, in percentage points, to your legend-grade summon probability.

This is the meta hook: an out-of-battle investment (grinding slot levels on the calm formation screen) that reaches into the in-battle gacha and nudges the odds of the rarest pulls. The whole board becomes a single dial on your luck.

We drew one hard line here. Guidance of Starlight boosts regular Chaos Shard summons — but it does not apply to the Dragon Scale gamble event. The gamble is meant to feel like a clean, high-variance coin flip; letting accumulated grind quietly weight it would blur the one moment in the game that’s supposed to be pure risk. Keeping that boundary intact protects the gamble’s identity.

Duplicates, merges, and a hard ceiling

Summon a Successor you already have and the merge happens immediately — no menu, no confirmation. There’s a strict priority for which copy folds into which (promoted status, highest rank, and oldest-summoned win the role of the surviving unit), so the outcome is never ambiguous.

And when a class’s slots are already full and it summons another of that class, the game doesn’t overflow — the summon converts into a global passive buff instead, a system we call Soul Resonance. Overcapacity becomes power rather than waste. A full board is never a dead draw.

What’s live, and what’s honest to admit isn’t

As of our last verification pass, the load-bearing parts are in and working, client and server: placement, slot enhancement, Guidance of Starlight, formation stats, the summon-weight math, and all three synergies. Still on the list: the ten alternative formations, the reserve-force reinforcement call, Soul Resonance, and vertical (hierarchy) synergy across rows.

We ship the spine first and add limbs later — but the spine here is the interesting part. A screen that looks like drag-and-drop is really a place where every small, patient investment quietly rewrites the probabilities of the fight to come. That’s the kind of depth we like: invisible until you go looking, and rewarding exactly the players who do.

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