Worked on the foundryvtt/pf2e repository to address a rules compliance issue in the Hemlock Stage 3 damage calculation, ensuring that damage outcomes now align precisely with the intended game mechanics. Focused on bug fixing within a TypeScript codebase, the solution involved correcting the logic responsible for applying damage, which stabilized combat calculations and reduced the risk of user confusion or support requests. The fix was thoroughly validated against existing test suites to minimize regression risk and was integrated with clear documentation. This work demonstrated attention to detail in game development and contributed to the overall reliability of the combat system.