5E MONSTER BUILDER
Bestiary
The SRD bestiary, built in, next to a builder for the things you invent. Custom monsters behave exactly like the shipped ones everywhere else in the app: encounters, cards, the lot.
THE HOMEBREW MONSTER PROBLEM
You built a great monster. Now it lives in a document that combat can't read.
Writing a monster is one of the genuinely fun bits of prep. You give it a nasty reaction, a resistance that makes the party rethink, a legendary action that turns round three into a problem. It takes an hour and it's worth it.
Then Friday arrives and it's a block of text in a file, while every SRD monster in your tools is a first-class object that slots into initiative. So you retype it, or you run it off a second screen, and half the things you designed get forgotten because they weren't in front of you.
The Bestiary makes your monsters the same kind of thing as the shipped ones. Build it once; it runs in combat, prints on a card, and shows up in the encounter builder like it was always there.
What you get
Open5e built in
The SRD bestiary ships with it. You start with a library, not an empty shelf.
A real builder
Build stat blocks properly: actions, traits, resistances, legendary actions and all.
Runs everywhere
A monster you wrote drops into an encounter exactly like a shipped one. No second format.
Reveal sheet
Show players exactly the parts of a stat block you want them to see. No more, no less.
Prints as a card
Any monster becomes a Card Forge card. Deal it face-down and let them wonder.
Generation, optionally
Stuck for a stat block? Generate one and edit it. Or switch AI off and never see the button.
THE REVEAL SHEET
Showing the party a stat block shouldn't be all-or-nothing.
The wizard rolls a 22 on an Arcana check about the thing that just ate the ranger. The honest answer is "you know some of this", but the tooling usually gives you two options: describe it from memory, or hand over the whole stat block and delete the mystery.
The reveal sheet is the middle. Expose the resistances and not the hit points. Show the legendary actions and keep the reaction back. The party learns something real and still doesn't know what's coming.
Questions a DM would actually ask
What content comes with it?
Open5e's SRD monsters, free and built in. Everything that's free to us is free to you, and free to your players, who get a Bestiary tab showing the creatures they've actually encountered.
Can I build proper stat blocks, or just notes?
Proper ones. Actions, traits, resistances, senses, legendary actions: the full shape. It matters because the encounter runner reads them: a monster that declares legendary actions gets a legendary-action counter in combat automatically.
What's the reveal sheet?
A view of a monster showing only what you choose to expose. Useful after a successful Arcana check, or when you want the party to know the troll's regeneration without handing over its full stat block.
Do custom monsters work everywhere?
Yes, and that's the point of building them here rather than in a document. A homebrew monster appears in encounter building, runs in the tracker, prints as a card and shows in the reveal sheet exactly like an SRD one.
How many custom monsters do I get free?
Three on the free DM tier, on top of the entire SRD library. Pro removes the cap.
Can I import a stat block I already have?
You can build it in the editor, and the generator can give you a starting point to correct instead of a blank form. There's no bulk importer for arbitrary third-party formats. That's a real limitation, and we'd sooner say so than bury it.
Give your best monster a stat block that fights.
The whole SRD library is there already. Add the three you actually invented.
Open your grimoire for freeNo card. No beta waitlist. Always free for your players.
IN THE SAME GRIMOIRE
Spellbook
The SRD spell list plus your own homebrew, with a level advisor for when you're not sure what you've built.
Character Sheet
Export a filled-in, illustrated character sheet for any party member. Paper, for the table that likes paper.
Reliquary
A DM screen, the rules you keep looking up, your house rules, and trackers for the things you always forget.