The Prism Slime is a Local Legend added in the Luna VIII (version 6.7) update, sitting out in the open fields of the Frost Moon map alongside the ordinary elemental slimes. It punishes single-element teams by stealing your active character’s energy and locking out that element, which is why a straightforward damage rush usually fails to pick up every reward on the first try.
Quick answer: Enter with a disposable on-field character so the slime absorbs an element you do not need, keep the energy-absorb count at two or fewer before it first swells, fill its gauge within 29 seconds using off-field reactions, and kill it before it swells for a third time.
Prism Slime location in the Frost Moon
The boss lives in the Lunar Highlands region of the Frost Moon, on a small patch of land between the Lunar Pool and Ungien’s Circle. You need to progress the Moon Gazing world quest to reach it, and finishing the first act of that quest opens up the area.
All Prism Slime reward objectives
Three objectives are attached to this fight, and all of them can be cleared in a single attempt with well-built characters. The two conditional objectives are the tricky part, since both depend on how you manage the swell cycles.
| Objective | Reward |
|---|---|
| Defeat Local Legend: Prism Slime | 20 Primogems, 3 Slime Concentrate |
| Keep energy-absorb attempts to 2 or fewer before it first swells | 20 Primogems, 25,000 Mora |
| Defeat it before it enters light-gathering mode a third time | 20 Primogems, 3 Guide to Moonlight |
After the kill, open the Valiant Chronicle Handbook at any Adventurer’s Guild station and speak to Katheryne to collect everything you earned.
How the energy absorption mechanic works
The Prism Slime’s core gimmick is elemental theft. At roughly 10-second intervals, signaled by a small bar appearing to the right of its HP meter, it drains the energy of whoever is on the field and becomes immune to that character’s element, turning into the matching elemental slime. Because of this, any mono-element composition is effectively useless here.
You want to control which element it steals. Walk in with an on-field character whose element does not carry your team’s damage, and let the slime absorb that one. Once it has locked in a harmless element, swap to your off-field units and pile on Elemental Skills. Triggering reactions is the fastest way to fill its gauge, and you must fill that gauge within 29 seconds to stay under the two-absorb limit for the second objective.
When the gauge fills, the slime returns some energy to your team, swells up, and enters an Overdrive state. It scatters more slimes and unleashes a large area attack that deals physical damage, so move away during that swing. In this swollen form it drops all element immunity and becomes vulnerable to every element. After a short window it flattens into a deflated state that takes increased damage, then eventually returns to its normal energy-absorbing form.
Note: Characters like Mavuika and Skirk use special energy systems, so the slime cannot drain their energy. It will still gain immunity to their element, though, which means the “let it absorb a harmless element” plan still applies. Fights built around them can also drag on longer, making the reward objectives harder to hit cleanly.
Best teams for the Prism Slime
The ideal setup pairs an on-field enabler that mostly relies on its Elemental Skill with strong off-field sub-DPS units. Enablers like Chasca, Varka, and Sandrone keep pressure going while the slime is locked out of an element, and heavy off-field hitters such as Durin and Ineffa provide the damage. In practice almost any team can work here, as long as you let the slime absorb an element that is not essential to your damage.
| Core unit | Suggested party |
|---|---|
| Mavuika | Mavuika, Citlali, Xilonen, Bennett |
| Skirk | Skirk, Shenhe, Escoffier, Furina |
| Sandrone | Sandrone, Yae Miko, Qiqi, Nicole |
| Chasca | Chasca, Ineffa, Iansan, Columbina |
| Varka | Varka, Jean, Nicole, Durin |
If you run Nicole or another off-element unit, put them on the field specifically while the slime is absorbing energy. That way it locks out an element that contributes nothing to your damage, and your real hitters stay unaffected.
Kill it inside two swell cycles
The third objective is the real damage check. The slime should only turn big twice during the whole fight, so you need enough burst to finish it within those first two swollen windows. Every time it swells and drops its immunity, that is your opening to dump maximum damage before it deflates and returns to normal.
You know all three objectives landed when the boss dies and the Valiant Chronicle entry marks each condition as complete. If you are struggling to hit the damage window solo, run the fight in co-op mode at World Level 9, which shares the boss’s health pool across players while still granting the full rewards.
Like most overworld enemies, the Prism Slime respawns after the daily server reset at 04:00, so you can farm it again each day. Clear it once, collect from Katheryne, and it slots neatly alongside the other Frost Moon Local Legend on your daily route.
