Frank kills the DCU (for real)
Frank Castle vs DCU. Frank Castle gets a GL ring and is taught for 100 years by an experienced (not the very best but a good GL) Green Lantern. He then gets taught by Big G on the construction and maintenance of the punisher robots, Frank then becomes an expert specfically in this area. Frank Castle is then given 10 Punisher robots and GL ring recharger
Frank gets a map of the DCU, the map only gives basic information. He is teleporeted to an isolated area of the DCU (some car factory in the desert) and has two years to construct a plan to conquer the DCU.
DCU is informed 1 day before Frank attacks. Frank has been told if he suceeds he gets his family back.
P.S. Robots are immune to defeat via matter manipluation, or trapster substance in internal circuirty.
P.P.S Assume Frank cant be detected in his base of operation but you have to determine wether Frank can stop himself from being detected while he gathers prep or resources.