Monster Arena
Pick two D&D monsters and watch them battle using real SRD stat blocks. Attack rolls, damage dice, AC, and HP all simulated turn by turn. 334 monsters with CR filtering and round-by-round combat log.
About Monster Arena
Choose any two creatures from a pool of 334 tabletop games-rooted monsters — an Ancient Red Dragon versus a Beholder, a lowly Goblin against a Troll — then watch them trade blows using the official D&D 5e SRD stat blocks. Every attack roll is resolved against the defender's AC, every hit pulls from the correct damage dice, and HP counts down in real time until one side drops. Nothing is hand-wavy; the math is exactly what you'd see at a table.
The round-by-round combat log is where it gets interesting. You can trace exactly why the Gelatinous Cube survived three rounds against a Werewolf, or how lucky crits swung a fight that looked lopsided from the start. CR filtering helps you set up fair matchups or deliberately absurd ones.
If you enjoy creature-stat deep dives, Who's That Pokémon? goes in a different direction but scratches a similar curiosity about knowing your monsters cold. Monster Arena works best on a wider screen, where the full combat log and stat panels sit side by side without scrolling.
Look inside
How to use
• Browse and select two D&D monsters from the lists, or use "Random matchup" for quick setup • Use search boxes and CR (Challenge Rating) filters to find specific monsters • Click on any monster in the lists to select them as Fighter 1 or Fighter 2 • Once both fighters are chosen, click "Fight!" to start the automated battle • Battles use real D&D 5e stat blocks and combat mechanics • Monsters automatically attack each other using their abilities, attacks, and defenses • Watch the health bars decrease as fighters take damage • Battle log shows all dice rolls, hits, misses, and damage in real-time • Battles are fully automated - just sit back and watch • "Rematch" runs the same fighters again with new dice rolls • "New Fight" returns to monster selection • Your win/loss record tracks Fighter 1 vs Fighter 2 results across all battles • Each battle outcome depends on dice rolls, so the same matchup can have different results The app simulates authentic D&D combat between any monsters from the SRD database.
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