Landed knights are revered as heroes of order, legends in shining armor. You’re out to take those poncy fops for all they’ve got. You’re a hedge knight, a working-class cavalry soldier with few profitable skills besides the fight. You...

You, and a couple of your friends, will portray the members of a punk band going on their first proper tour. You’ll play gigs and use your music to spread your message, getting more momentum as you go, until your voices are loud enough to...

At the peak of the cold war. The organization known as F.A.N.G. has discovered what the US has been calling Operation Frost Giant. Recruiting the disgraced Nazi scientist, Dr. Victor Frankenstein, they are using the supernatural and occult...

This adventure is a highly destructive one- or two-shot, wherein the beloved pack of Nazi-slaying vampires will wreak Havoc (hehe ^^) on the Third Reichs war-critical fuel production plant. Turn the Nazi’s Autarkiebestrebung (striving for...

Take on the roll of scrappy partisans piloting a shoddily welded-together mech into battle in this 5 page TTRPG for 2-6 players. Technicals is powered by the Havoc Engine. It uses ideas from the Havoc Engine, published by Rowan, Rook and De...

Welcome to Greene County. You are a group of broke anthropomorphic homies. One day you come across a promotion for FREE FOOD. However, there's a big problem. It's a limited time POP-UP that ENDS TODAY. Worse of all, it’s all the way acros...

You are MASAMUNE , a legendary swordsman now well past his prime. Once of harmonious mind, a curse cast many years ago fractured his mind into 6 distinct characters, each one now vying for control at any given moment. The one who cast this...

Shoulder Parrots and Hooks for Hands is a havoc engine capsule game created for the Havoc Engine Game Jam (March 2, 2026 - March 31 2026). Welcome Welcome to Shoulder Parrots and Hooks for Hands. This is a capsule RPG. That means that after...

Only Trust Your Fists is a TTRPG in the style of arcade beat-em-ups from the late ‘80s and early ‘90s – Streets of Rage , Final Fight , Double Dragon , etc. It’s also got elements of the inspirations for those games, kung fu flicks...

"I felt like a climate kaiju." -- Jaffa 6, playtester. GREEN THE GRID! is a game that has been sitting in my mind for a long time, and it only found form thanks to Rowan Rook & Decard's Havoc Engine Game Jam , for which this is an entry. Wh...