Promise Ring is documented as Unit Equipment from Release Update (0.0), released July 17, 2026. Its listed roll fields are -1% to -5% SPA and +1% to +10% Damage. It is reserved for Cursed Student (True Love). The reference names School Grounds as its source.
Use this page to answer three questions before spending: can the selected unit equip it, do its exact fields improve that unit’s role, and is the documented source still active in the current server?
Promise Ring
Required unit: Cursed Student (True Love)
Source: School Grounds
Release: July 17, 2026 · Release Update (0.0)
What Promise Ring does
The documented rolls are -1% to -5% SPA and +1% to +10% Damage. A lower SPA is beneficial, but compare real attack cycles instead of reading the minus sign as a penalty. Damage is broadly useful, but it does not replace uptime, coverage or a passive that fits the stage. Read each roll as an interval: the item can appear or be rerolled within that range according to the reference. The top value is not guaranteed.
Promise Ring has one documented passive. The panel below keeps the reference values and named mechanics together. For Unit Equipment, the reference says these effects override the original passive; compare the equipped and unequipped kit rather than assuming both versions stack.
Spirit Bats
For every 20 total Bleed stacks inside this unit’s range, summon a Bat Spirit at the unit’s position, up to 3. Each deals 25% of current damage per attack and despawns after 3 attacks. This overrides the original passive.
How to get Promise Ring
The reference lists School Grounds as the source and does not display a crafting recipe on this item page. That does not establish a drop rate or Shop price. Open the current reward or purchase panel and confirm the item name before spending time or currency.
When a map or event appears alongside Armory, treat both as documented sources, not as equal odds. The page does not provide a reliable drop percentage, pity counter or act number. Check the reward panel before entering, and stop farming if the current server no longer displays the item.
Best use and compatibility
This is exclusive to Cursed Student (True Love). Base forms, similarly named units and other evolutions are not interchangeable. Open the compatibility panel and confirm the parenthesized form before rerolling. Because this item can override an original passive, test the complete behavior of the evolved form after equipping it.
Compare it with one alternative in the other Standard slot, or with the same unit unequipped. A carry wants consistent stage coverage and boss output; a controller cares about trigger uptime; an opener cares about early cost and timing. The best use is the one that improves a measured failure without breaking another part of the team.
Reroll and Equipment Lock plan
The reference says dice identify rollable fields. This page includes a passive, so verify whether its range or strength is marked with a dice in the current card before rerolling. Equipment Rerolls can change marked fields, while Equipment Locks preserve a chosen result.
Run one baseline before rolling. Decide an acceptable result, a strong result and a hard resource limit. Lock a field only after it improves a repeatable clear. Never erase a functional roll merely because the number is not maximum, and always read the current cost in the confirmation dialog.
Controlled test route
- Record unit form, trait, potential, equipment, map, difficulty and party size.
- Run the stage without Promise Ring and note first leak, boss result and clear time.
- Equip Promise Ring without rerolling; repeat the same placement and upgrade order.
- Confirm every named trigger or stat change in the live panel.
- Reroll only if the base piece already helps and the next field has a clear purpose.
- Repeat the benchmark after a balance update because passive timing and ranges can change.
This method separates the item’s value from changes in support units, modifiers or upgrade timing. For a passive with a capacity, interval or range condition, create a stage situation where that condition can actually occur.
Common mistakes
- Equipping by artwork or name instead of compatibility.
- Reading a negative SPA roll as a penalty; lower SPA is normally the favorable direction.
- Using Physical or Magical Damage Dealt on the wrong archetype.
- Calling the maximum roll “guaranteed.”
- Assuming reference sources include a fixed drop rate or pity.
- Rerolling before testing the base piece.
- Assuming an overridden Unit Equipment passive stacks with the original.
- Comparing runs with different maps, positions, traits or support units.
Promise Ring FAQ
Is Promise Ring Unit or Standard Equipment?
It is documented as Unit Equipment. The required designation is Cursed Student (True Love).
What stats can Promise Ring roll?
The reference lists -1% to -5% SPA and +1% to +10% Damage. These are ranges, not guaranteed outcomes.
Where does Promise Ring come from?
The reference lists School Grounds. Any exact drop rate, pity, price, rotation or act still needs confirmation in the live game.
Is Promise Ring best in slot?
That cannot be decided from the name or maximum roll alone. Compare it on the intended unit and mode, with the same team and upgrade order, then keep it only when the measured result improves.