Delta Green: Blood Type Generator

Here you have a piece of my home campaign's history. 

When I was running "The Last Equation" last year, one of the Agents got badly stabbed and the others were desperate to find someplace for treatment. Someplace discreet. Someplace they wouldn't have to waste hours talking to police. They asked about finding a crime-friendly veterinarian. 

I said they could find one with some legwork and a Criminology roll, but the results wouldn't be as good as a proper hospital. Aside from everything else, a vet's office is unlikely to keep fresh human blood bags on hand for transfusions. 

One of the players suggested donating their own blood to offset the penalty. I loved the idea. I thought about just calling for a Luck roll to see if that would work out, but I thought it might be fun to find out exactly which Agents could be any help to each other. The players loved that idea. 

So we looked up how frequent different blood types are in the U.S., where the campaign takes place. The players all rolled and wrote down their Agents' blood types for future reference. It turned out, one of them was a match. I said that allowed the "hospital" bonus, which brought the surgeon's chance from 50% to 70%. When I rolled a 55, the bonus made it a critical success rather than a critical failure. The transfusion saved the wounded Agent's life.

Here's how it works in my campaign.

BLOOD TYPES AND SURGERY

In most cases, a surgeon gets a +20% bonus to a Surgery roll when treating an Agent in a well-appointed hospital. That bonus does not apply in less favorable circumstances. But if a fellow Agent provides blood for an emergency transfusion, that grants the +20% bonus even outside a proper hospital. Assuming, that is, their blood types are compatible.

1D100 ... BLOOD TYPE
01–38 ... O positive
39–44 ... O negative ("universal donor")
45–79 ... A positive
80–85 ... A negative
86–96 ... B positive
97 ... B negative
98–99 ... AB positive
100 ... AB negative ("universal recipient")