How to use the random monster generator
- Set the challenge rating with the slider, or open Fit my party and let the tool pick a CR for your group's size and level.
- Choose a type, terrain and role, or leave them on Any for a surprise. The terrain shapes the name, colours, lair and damage type; the role shapes how it fights.
- Read the monster card: a picture, what it looks like, how it behaves, where it lairs, what it carries, and a story hook.
- Run it. The stat block is ready for 2014 or 2024 rules. Print it, copy it into Homebrewery, or open it in the Stat Block Maker to change anything.
What is on the monster card
- The top line shows the CR, the XP it is worth, its role and its terrain.
- Look, behaviour and lair tell you how to describe it and where the party finds it. The behaviour line comes from the role, so an ambusher waits in hiding and a defender guards something.
- Loot is one treasure or story idea, such as a key, a map or something an alchemist would buy. Add coins or magic items to suit your campaign.
- The story hook gives the party a reason to care, so the monster becomes a quest and not just a fight.
- The threat bar compares the monster with the party in Fit my party (4 players at level 3 until you change it), from Easy to Deadly.
- The stat block has everything you need to run it, in the 2014 or 2024 layout, in one or two columns.
How the numbers are made
Every monster's hit points, Armor Class, attack bonus, save DC and damage per round are set from the CR with our own formulas, fitted to typical published monsters. Then the role adjusts them: a brute has more hit points and hits harder, a defender has a higher Armor Class, an artillery monster attacks from range. Finally the tool checks the finished stat block with our CR estimate (the same one the Stat Block Maker uses) and tweaks the hit points until the two agree. XP and proficiency bonus come from the free rules (SRD 5.1).
Build an encounter for your party
Open Fit my party, choose the number of players, their level and how hard the fight should be, then press Set the CR. Our rule of thumb starts from the party's level, scales it by the number of players (four is normal), then lowers it for an easy fight or raises it for a hard or deadly one. For example:
- 4 players at level 3, medium fight: CR 3.
- 3 players at level 1, medium fight: CR 1/2.
- 5 players at level 5, hard fight: CR 8.
Make a boss rush uses the same party to build three fights that get harder: a warm-up, a hard fight and a boss. For 4 players at level 3, that is CR 2, CR 4 and CR 5. It keeps the type and terrain you picked, so the three monsters feel as if they share one place. Press Open next to any of them to see its full card. The rule of thumb is for one monster at a time. For a group, give each monster a lower CR and watch the first round closely.
Example monsters
Fern Weaver
CR 1/2 (100 XP) · Small beast · Skirmisher
A tall and gaunt weaver with skin that shifts colour as it moves. It picks off stragglers and is gone before help arrives. It makes its lair in a thorn thicket that no path reaches.
Hollow Prowler
CR 4 (1,100 XP) · Large undead · Brute
A lean and long-limbed prowler with old chains still wrapped around it. It never retreats, even when it clearly should. It makes its lair in a collapsed temple open to the sky.
Gloom Slime
CR 9 (5,000 XP) · Large aberration · Controller
A massive and hunched slime with markings like ancient writing. It herds intruders toward a trap or a long drop. It makes its lair in a forgotten crypt below the city sewers.
Slag Scalewing
CR 16 (15,000 XP) · Huge dragon · Brute
A thick-bodied and patient scalewing with a crown of bony spikes. It goes after whoever hurt it last and ignores everyone else. It makes its lair in an obsidian cave lit by a fire river.
Monster roles explained
- Brute: hits hard, lots of HP.
- Skirmisher: fast, darts in and out.
- Defender: tough, guards others.
- Artillery: attacks from range.
- Controller: slows, traps, frightens.
- Ambusher: hides, strikes first.
Mix roles in one encounter. A defender in front, an artillery monster behind it and an ambusher in the shadows makes a fight your players will remember.
Tips for running a generated monster
- Let the terrain set the mood. Terrain picks the first word of the name, the colours, the lair and the damage type of special attacks: a swamp monster leans to acid, a tundra monster to cold and a sky monster to lightning. Change the terrain to give the same idea a new skin.
- Use the recharge. An action marked "Recharge 5–6" comes back when you roll a 5 or 6 on a d6 at the start of the monster's turn. Use it early for a big opening, then let the dice decide.
- Expect more at higher CRs. From CR 2 a monster attacks twice, from CR 6 three times and from CR 13 four times. From CR 11, about two monsters in three are legendary, with three legendary actions.
- Play the role's trick. From CR 1, a defender has a Guard reaction that protects its allies, and a skirmisher can dash or slip away as a bonus action. Use them, or the monster will feel like a sack of hit points.
- Train your eye. A few games of Guess the CR make you faster at judging your own homebrew monsters.
Frequently asked questions
Are these monsters balanced?
They are built to our CR estimate, which compares hit points, Armor Class and damage with typical monsters of each CR. That makes a good starting point. Always watch how the first round goes and adjust on the fly.
Can I use the monsters in my own adventure?
Yes. The names, descriptions and stat blocks are made by the tool from original tables, so they are free to use. Game terms like "Armor Class" and the XP values come from the free SRD 5.1, credited on our credits page.
What is the difference between the 2014 and 2024 layouts?
The numbers are the same. The 2024 layout shows initiative, a combined ability and saving-throw table, and the newer "Attack Roll" wording.
Can two monsters fight each other?
Yes. Press Find a challenger for a seeded duel with a play-by-play log. Share the link and your friend sees the exact same fight.
Can I make a sea monster?
Yes. Set the terrain to Coast & sea. The name, colours and lair come from the sea, special attacks lean to cold damage, and it may get the Amphibious trait. The body shape comes from the creature type, so press New monster until you get a serpent, fish or tentacled body, which can swim. Beast, Aberration and Monstrosity can all have one.
How does the generator name monsters?
Each name joins a word from the terrain with a word from the body shape, such as Mire Stalker, Frost Weaver or Ember Drake. It is a handy trick for naming your own monsters too: say where it lives, then what it does or looks like.
Does the bestiary keep my changes from the Stat Block Maker?
No. The bestiary saves each monster's seed and settings, so it rebuilds the exact same monster later. If you change a monster in the Stat Block Maker, press ★ Save there to keep your version in that tool's library.
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