What is a Core Skill in Aniimo?

Every Aniimo has exactly one Core Skill: an upgradeable move baked into its kit that raises the creature’s overall effectiveness when invested in. Upgrades cost Prismatic Stones, a limited resource, so choosing which Aniimo to upgrade is a real build decision.

How do Core Skills work in Egg Heist?

In Egg Heist you pick one main Aniimo, which keeps access to its full kit. Your three other team members are each limited to a single predetermined move: their Core Skill. That makes the strength of a Core Skill the deciding factor for three of your four squad slots.

How do you get Prismatic Stones in Aniimo?

The in-game item card lists three sources: the Fun Stamp Collection Shop, Item Exchange, and Upgrade Level rewards. Each Skill Boost costs one Prismatic Stone. Because supply is constrained, stones spent on one creature are permanently unavailable to the rest of your roster, which is why upgrade order matters more than upgrade speed.

What is Irisalis’s Core Skill?

Irisalis Shadow, a Magical clone skill: after Iris Shot hits a target, it summons an Iris Clone that immediately fires a Floral Gleam Beam. Boosted with a Prismatic Stone, every cast summons an additional clone, all clones last 30 seconds, and the skill gains a Damage tag.

Which Aniimo should you upgrade first?

For Egg Heist, prioritise the three support slots over your main: the main fights with its full kit anyway, while the other three contribute nothing except their Core Skill, so an upgrade there changes far more. Judge candidates by what the single move does, not by how good the creature is in the open world.

Gameplay · 5 min

Aniimo Core Skills: Every Boosted Version, Side by Side

Every creature carries exactly one Core Skill, and the boosted versions are not on the official wiki. All 53 captured side by side, the Legendary included, plus where Prismatic Stones come from and why Egg Heist makes three of your four slots depend on this.

Written by

Klepto

Beta testing and research by Klepto, published here with permission

By KleptoPublished 2026-09-06Updated 2026-09-08

Every Aniimo Core Skill in Beta 3 (Full Guide) — Video credit: Klepto on YouTube · embedded with attribution. Watch on YouTube

The short answer: every single Aniimo comes with exactly one Core Skill, an upgradeable move that boosts the creature's overall effectiveness, and upgrading it costs Prismatic Stones, a limited resource. That combination makes every upgrade a real decision, and one mode in particular punishes getting it wrong.

That mode is Egg Heist. Out in Idyll you can swap between your Aniimo mid-fight and lean on whoever fits the moment. In Egg Heist you cannot: one main Aniimo gets its full kit, and your other three team members are each limited to a single predetermined move. That move is their Core Skill.

So before you spend a single stone, it is worth knowing exactly what you are buying. This guide covers how the system works, and then the part the official Aniimo Wiki does not document: all 53 Core Skills captured in the Skill Boost screen, base and boosted versions side by side, from my beta testing. Including the Legendary's.

What a Core Skill actually is

Every creature in the game carries one Core Skill. Not one per role, not one per element: one per Aniimo, baked into its kit alongside its other moves. What makes it special is that it is the move the game lets you invest in: upgrading a Core Skill raises that Aniimo's overall effectiveness, not just the one button.

In ordinary play you can treat it as a strong part of a larger kit. The reason to learn which move is your Core Skill, and what its upgraded version actually changes, is that two systems put weight on it: the upgrade economy, and Egg Heist.

Prismatic Stones: the resource that makes it a choice

Core Skill upgrades cost Prismatic Stones, and Prismatic Stones are limited. The in-game item card describes them as "a precious gem used to enhance an Aniimo's core skill", and lists three sources: the Fun Stamp Collection Shop, Item Exchange, and Upgrade Level rewards. A Skill Boost costs one stone per skill, and you will not have enough to upgrade everyone: every stone committed to one creature is a stone another never sees.

The Prismatic Stone item card in Aniimo: a precious gem used to enhance a Core Skill, obtained from the Fun Stamp Collection Shop, Item Exchange and Upgrade Level

That is the entire tension of the system. If stones were farmable at will, Core Skills would be a checklist. Because they are scarce, they are a build decision, and a wrong early investment follows you: the resource you spent on an Aniimo you stopped using is gone.

The practical consequence: do not spend on reflex in your first hours. Upgrade once you know which creatures you actually field, and for which mode.

Why Egg Heist raises the stakes

Egg Heist changes the rules of engagement. In the open world, an underwhelming skill is a detail, because you swap to another creature. In Egg Heist your squad works differently:

Your main Aniimo fights with access to its full kit, exactly as in Idyll.
Your three other team members each bring one predetermined move to the match: their Core Skill. Nothing else.

Read that again from a team-building angle: three quarters of your Egg Heist squad is only as useful as its Core Skill. A creature that is excellent in Idyll can be a poor Egg Heist pick purely because its Core Skill contributes little on its own, and a modest creature with a strong, upgraded Core Skill can earn a slot it would never get otherwise.

With the launch letter confirming Egg Heist has been substantially reworked, with more obtainable egg types and a high-difficulty Chaos Mode, that support-slot math is about to matter to a lot more players.

How to spend your stones without regret

The rules above imply a spending order, and it is not the obvious one:

Prioritise the three support slots, not your main. Your main brings a full kit to Egg Heist, so it benefits least from the one-move upgrade. The three creatures who bring nothing but their Core Skill are where an upgrade changes the whole match.
Judge the Core Skill on its own, not the creature. For a Idyll team, ask what the whole kit does; see our best teams and tier list for that. For Egg Heist slots, the only question is what this one move does unupgraded versus upgraded.
Hold stones you have no plan for. Scarce resources reward patience in every game that has them, and this one is no exception: a banked stone loses nothing, a misspent one is gone.

The upgraded versions are the half of the system the official wiki does not document, which is why testing them matters: what a Core Skill becomes after investment is exactly the information you need before committing stones, and it is what I have been mapping through the betas. Bring your questions to the launch version, and spend like the stones are as rare as they are.

All 53 Core Skills, base and boosted side by side

Everything below is captured from the Skill Boost screen in the beta: the base Core Skill on the left, the boosted version on the right, one Prismatic Stone per boost. These upgraded versions are not documented on the official wiki, which is exactly why they are here. Skills are grouped by element; click any Aniimo to open its full kit in the Aniidex.

One capture deserves its own billing. Irisalis Shadow is the Legendary's Core Skill: after Iris Shot hits, it summons an Iris Clone that fires a Floral Gleam Beam, and the boost adds a second clone with every cast. If you followed the Irisalis catch rework, this is what the journey ends on.