I'm just gonna say it but Forgotten ruins is Skull Merchant's best map, slapping drones right next to portal exits is so stupid it should be cheating. Just use batteries not included and you'll be racking up easy 10% hastes too which is always nice. I just wish I was better at drone placement when it comes to stuff like the Garden of Joy upper house window by the generator, anti-hostage tech really is a fun thing to learn about.