Core Keeper armor sets and set bonuses: how they count, which ones pay early, and the ring slot trap

70 sets in the data, most of them three pieces. Here's how the piece count works, which sets give you something before the set is complete, and why two-ring sets cost you more than they look.

By MaxPublished 29 Oct 20264 min read

Data is from the Core Keeper Wiki (data labelled 1.2.0.7). The game has moved on to 1.3.x, so some sets or numbers may have changed. I haven't tested these in-game.

Equip enough pieces of the same set and you get a bonus on top of what the pieces do by themselves. That's the whole idea. The details are where it gets interesting, because the data shows some sets that give you something at two pieces and some that give you nothing until the last one.

What the data says about sets

There are 70 sets in the wiki data:

Pieces aren't only helmets, chests and pants. Rings and necklaces count, too: 22 of the 70 sets include at least one, and 13 are jewellery only. The Miner set is five pieces (helm, suit, pants, necklace and ring), and the Slime set is just a necklace and a ring.

The bonus is triggered by how many pieces you have, not their level, and in the data the value is fixed. The Iron set's 3-piece bonus is +19% armor at low health whether the pieces are level 5 or level 20, while the pieces' own stats go up by two and a half to three times over that range. So the set bonus is a flat bonus on top of gear that keeps growing. It matters most early and a little less later.

Sets that pay before you finish

For 21 of the 70 sets, the first bonus arrives before the last piece. A few that do:

• Sentry/Stone (Golem set), 2 of 3 pieces: +20% damage against bosses.
• Core Commander, 2 of 3: +25% damage dealt by you and nearby allies. At three pieces, nearby enemies also take 67 radioactive damage every other second. That 2-piece bonus is a team bonus, so it's one for co-op.
• Miner, 3 of 5 and 5 of 5: a short movement speed boost after mining a wall at three pieces, and 8% of your mining damage added as melee damage at all five.
• Pandorium, 3 of 3: +80% melee damage and +14.3% movement speed. The data's internal name for the melee bonus suggests it only applies while you haven't taken damage. I haven't confirmed that, so check it in-game before you build around it.

The rest, which is most of them, give you nothing until you have the whole set. For those, wearing two of three pieces is the same as wearing none of them as far as the bonus goes, so the pieces have to be good enough on their own to justify the slot.

A few three-piece bonuses, for flavour

The Assassin set is a two-piece (hood and cloak) giving +26.6% melee and ranged attack speed for a short time after dodging. Nothing about these is hard to understand, but the conditions matter: "while at max health" asks you to avoid damage, and "while at low health" asks you to be in trouble. They're different play styles.

Is a set worth it?

There's no formula for that, but you can compare. Take the three-piece Iron set at level 10. Its pieces give +86 max health, +46 armor and +24.3% damage, plus the +19% armor-at-low-health bonus. Now swap one piece for something better from another set: you lose the bonus, so your question is whether the replacement beats the bonus. Coreplan shows both sides at once, which makes this a ten-second check instead of a guess.

The Galaxite set at level 20 adds +172 max health, +91 armor and +69% critical hit damage before the +12.7% bonus. In that situation the bonus is a minor part of what you're wearing, so there's more freedom to mix pieces if something else fits your build better.

The ring slot trap

You have two ring slots and one necklace slot. Rock and Stone is a two-ring set (Ring of Rock and Ring of Stone) with a +49 mining damage bonus when you wear both, which uses up your whole ring budget. Sets with one ring and one necklace, like the Slime pair (+13.1% physical range damage), leave a ring slot free. The Hydra Jewelry set is three pieces (two rings and a necklace), and its bonus starts at two pieces, so you can get it from a ring and the necklace.

It's worth checking what you're giving up. At level 20 the Ring of Stone on its own gives +276 mining damage and the Ring of Rock +32 armor, so the pair's +49 is a modest extra on top of what the rings already do. That might be fine for a mining build, but it isn't free, because both slots are spoken for.