In Blox Monsters, a bloodline is a permanent passive buff tied to your character. Each bloodline carries its own set of stat boosts that scale with how rare it is, so the harder a bloodline is to roll, the stronger its perks tend to be. There are 16 bloodlines in the game right now, and you obtain them by rolling.
Quick answer: Roll for a bloodline to lock in a passive buff. Common bloodlines like Blizzardy, Dreadspike, Stormwing, and Cranesey each land at a 20.08% chance, while the rarest, Exile Celestial and Shadow Claw, sit at just 0.13% each.
How bloodlines work in Blox Monsters
Bloodlines are passive. Once you have one, its buff applies automatically without any activation. The stats they boost include movement speed, catch chance, rank luck, mutation chance, hatch time, and dispatch luck. Higher-rarity bloodlines often stack two stats and add a perk on top.
The rarity tiers map directly to roll odds. Common bloodlines appear at 20.08%, the next tier at 3.76%, then 1.63%, followed by 0.38%, and the rarest at 0.13%. The lower the percentage, the more impactful the buff you get.
All Blox Monsters bloodlines, stats, perks, and roll chances
The table below lists every bloodline with its stat boost, its perk, and the chance to roll it. Bloodlines with no perk only provide the listed stat. Azure Emperor’s stats and perk are not yet finalized.
| Name | Stat | Perk | Chance |
|---|---|---|---|
 Blizzardy | Movement Speed: +20% | None | 20.08% |
 Dreadspike | Catch Chance: 1.2x | When catching a hidden monster, you are guaranteed to receive a level D or above. | 20.08% |
 Stormwing | Rank Luck: +25% | None | 20.08% |
 Cranesey | Catch Chance: 1.2x | Perk luck +100% in dungeon. | 20.08% |
 Florahare | Rank Luck: +50% | None | 3.76% |
 Snow Queen | Mutation Chance: 1.4x | None | 3.76% |
| Snow Bloom | Catch Chance: 1.5x | When catching a hidden monster, you are guaranteed to receive a level C or above. | 3.76% |
 Wave Sprite | Rank Luck: +25% | Dispatch Luck +50%, 15% chance to double dispatch reward. | 3.76% |
| Azure Emperor | TBA | TBA | 3.76% |
 Milofoy | Rank Luck: +100% | None | 1.63% |
 Serpent Deity | Hatch Time: -15% | When hatching an egg, there is an additional 10% chance that the pet will have a Legendary trait. | 1.63% |
 Auroraflare | Rank Luck: +50% Mutation Chance: 1.2x | Dispatch Luck +100%, 33% chance to double dispatch reward. | 1.63% |
| Picomori | Catch Chance: 2x Rank Luck: +100% | When catching a hidden monster, you are guaranteed to receive a level B or above. | 0.38% |
 Sealed Calamity | Hatch Time: -25% | When hatching an egg, there is an additional 20% chance that the pet will have a mutation. | 0.38% |
 Exile Celestial | Rank Luck: +200% Mutation Chance: 2x | Dispatch Luck +150%, double the dispatch reward. | 0.13% |
 Shadow Claw | Catch Chance: 2x Mutation Luck: 2x | Dungeon Perk always above rare. | 0.13% |
Best bloodlines to chase
If you want the strongest passive overall, Exile Celestial is the standout. It combines +200% Rank Luck and 2x Mutation Chance with a perk that adds +150% Dispatch Luck and doubles dispatch rewards, all at a 0.13% roll chance.
Shadow Claw shares that same 0.13% rarity and leans toward catching. It grants 2x Catch Chance and 2x Mutation Luck, plus a perk that keeps your Dungeon Perk above rare. For hatching, Sealed Calamity cuts hatch time by 25% and adds a 20% chance for a mutated pet, while Serpent Deity reduces hatch time by 15% with a shot at a Legendary trait.
The four common bloodlines at 20.08% are the ones you will see most often. Dreadspike and Cranesey are the more useful of that group thanks to their perks, since Blizzardy and Stormwing only provide a single stat. Note that a bloodline cannot be improved once rolled, so re-rolling is the only way to move up to a rarer tier.
