Combat is the skill you level by killing monsters in the Mines, Skull Cavern, and the Volcano Dungeon. It uses the standard skill curve, so level 10 arrives at 15,000 total Combat XP, and it is the only skill whose main reward is survivability rather than a tool or a crop.
Health does not increase evenly. Levels 1 to 4 and 6 to 9 each add 5 maximum health, but levels 5 and 10 add none. Fighter (+15 HP) and Defender (+25 HP) are the only ways to gain health at those two level-ups, which is why a level 10 combat build without them caps lower than the level number suggests.
The Fighter versus Scout choice at level 5 is the one real decision. Fighter adds 10% damage to every hit and +15 HP, then branches into Brute (a further 15% damage, multiplied rather than added) or Defender (+25 HP). Scout multiplies critical chance by 1.5 instead of adding a flat amount, then branches into Acrobat (special-move cooldown halved) or Desperado (critical hits deal double damage).
Experience per kill varies far more than players expect. A Cave Fly is worth 10 Combat XP, a Serpent in the Skull Cavern is worth 20, and a Putrid Ghost is worth 25, while a Bug is worth 1. Monsters killed on the Farm give only one third of the normal amount. Reading a Combat Quarterly or Book of Stars grants a flat 250 Combat XP, which is roughly the same as twelve Serpents.
For the fastest levels, farm dense high-value rooms rather than wandering: 20-25 XP monsters such as Serpents, Iridium Bats, Mummies, and Putrid Ghosts beat clearing weak slimes, and it is far more efficient than slowly grinding floors with a weak weapon. Bring a weapon that matches your level, a stack of healing food, and a staircase or bomb route so a bad floor does not end the run.
Combat uses the standard skill curve, so level 10 is reached at 15,000 total Combat XP. The max health column counts only the health the skill itself grants: levels 5 and 10 add none.
| Level | Total Combat XP | XP to next level | Max health from the skill | Recipes and unlocks |
|---|---|---|---|---|
| Level 1 | 100 | 280 | 5 HP | HP +5, Sturdy Ring |
| Level 2 | 380 | 390 | 10 HP | HP +5, Life Elixir |
| Level 3 | 770 | 530 | 15 HP | HP +5, Root Platter |
| Level 4 | 1,300 | 850 | 20 HP | HP +5, Warrior Ring |
| Level 5 | 2,150 | 1,150 | 20 HP | Profession Choice: Fighter or Scout |
| Level 6 | 3,300 | 1,500 | 25 HP | HP +5, Slime Egg Press, Garlic Oil |
| Level 7 | 4,800 | 2,100 | 30 HP | HP +5, Ring of Yoba, Thorn Ring |
| Level 8 | 6,900 | 3,100 | 35 HP | HP +5, Slime Incubator, Explosive Ammo |
| Level 9 | 10,000 | 5,000 | 40 HP | HP +5, Iridium Band, Squid Ink Ravioli |
| Level 10 | 15,000 | — | 40 HP | Profession Branch |
A monster kill is worth far more or less than players assume, so the fastest route is always the highest-XP monster you can kill safely. Reading a Combat Quarterly or Book of Stars grants a flat 250 Combat XP. Monsters killed on the Farm grant only one third of the normal amount.
| Monster | Combat XP | Where it appears |
|---|---|---|
| Putrid Ghost | 25 | The Mines |
| Iridium Bat | 22 | Skull Cavern |
| Carbon Ghost | 20 | Skull Cavern |
| Iridium Crab | 20 | Skull Cavern |
| Mummy | 20 | Skull Cavern |
| Royal Serpent | 20 | Skull Cavern |
| Serpent | 20 | Skull Cavern |
| Shadow Sniper | 20 | Skull Cavern |
| Tiger Slime | 20 | Skull Cavern |
| Magma Duggy | 18 | Volcano Dungeon |
| Magma Sparker | 17 | Volcano Dungeon |
| Hot Head | 16 | Volcano Dungeon |
| Blue Squid | 15 | Skull Cavern |
| Dwarvish Sentry | 15 | Volcano Dungeon |
| Ghost | 15 | The Mines |
| Haunted Skull | 15 | The Mines |
| Iridium Golem | 15 | Skull Cavern |
| Lava Bat | 15 | The Mines |
| Magma Sprite | 15 | Volcano Dungeon |
| Shadow Brute | 15 | The Mines |
| Shadow Shaman | 15 | The Mines |
| Spider | 15 | Skull Cavern |
| Squid Kid | 15 | The Mines |
| False Magma Cap | 14 | Volcano Dungeon |
| Lava Crab | 12 | The Mines |
| Lava Lurk | 12 | Volcano Dungeon |
| Cave Fly | 10 | The Mines |
| Duggy | 10 | The Mines |
| Mutant Fly | 10 | Mutant Bug Lair |
| Sludge (Red/Purple/Copper/Iron Slime) | 10 | The Mines |
| Skeleton | 8 | The Mines |
| Big Slime | 7 | The Mines |
| Frost Bat | 7 | The Mines |
| Pepper Rex | 7 | Skull Cavern |
| Frost Jelly (Blue Slime) | 6 | The Mines |
| Metal Head | 6 | The Mines |
| Mutant Grub | 6 | Mutant Bug Lair |
| Stone Golem | 5 | The Mines |
| Wilderness Golem | 5 | The Farm |
| Rock Crab | 4 | The Mines |
| Stick Bug | 4 | The Mines |
| Truffle Crab | 4 | The Mines |
| Bat | 3 | The Mines |
| Green Slime | 3 | The Mines |
| Dust Sprite | 2 | The Mines |
| Grub | 2 | The Mines |
| Bug | 1 | The Mines |
Fighter adds a flat 10% damage to every hit and +15 HP; Scout instead multiplies critical chance by 1.5. At level 10, Brute multiplies a further 15% damage on top of Fighter, Defender adds 25 HP, Acrobat halves the cooldown of special moves, and Desperado makes critical hits deal double damage.
| Tier | Profession | Effect |
|---|---|---|
| Level 5 | Fighter | All attacks deal 10% more damage, +15 HP |
| Level 10 | Brute | Deal 15% more damage (multiplicative with Fighter) |
| Level 10 | Defender | +25 HP |
| Level 5 | Scout | Critical strike chance ×1.5 (multiplicative) |
| Level 10 | Acrobat | Special attack cooldown halved |
| Level 10 | Desperado | Critical strikes deal 2× damage |