BattleCast - D&D 5e combat simulator with grid-based battles

How I Built a D&D Combat Simulator in Three Weeks

It started the way a lot of side projects start - with a question I couldn’t let go of. I’d been pasting D&D encounter setups into Claude and ChatGPT for weeks, asking “who wins this fight?” The answers were fun to read but not very useful - different models gave different outcomes, and the same model would change its mind if you asked again. No real dice rolls, no positioning, no tactics. LLMs don’t simulate combat. They narrate what they think combat might look like. ...

April 23, 2026 · 13 min · Bartosz Jedrzejewski