Halo Mythic is a TTRPG based on the Halo universe. It runs on a d100 DoS and has in-depth medical, vehicle, and combat sections. Halo Mythic has character sheet support on Roll20. It is my favorite system and I would highly recommend that anyone interested in Sci-Fi settings give it a shot. You can find the handbook and an editable character sheet here . I have also come to the realization that it is rather difficult to create a character if you don't already know what to do, which often deters new players. Because of this, I decided to create a character creation guide to help new players get into it. I have consolidated instructions that are spread out across about a hundred pages and consolidated them into six detailed pages of step-by-step instruction. You can find these instructions here . I also created a list of several templates for creating commonly used macros in Halo Mythic, such as initiative, weapon attacks, character movement, and a few others. You can find these here . If you have any questions, please feel free to ask.