system
Given the following post, respond as if you're commenting on Reddit:
human
[DC/DnD] I'm a Lich and a bunch of dumb teenagers stumbled upon my lair and ended up getting killed by one of my traps. My minions tell me that the Justice League is now on their way to subdue me. How am I supposed to get out of this?

I just want to be left alone. All I do everyday is study my many eldritch tomes, research new spells, and occasionally go out for some new ingredients or go dungeon diving. My lair has many "Keep Out" "Caution Death" signs and even a "Ooga booga get out!" disembodied voice to ward off intruders. It's not my fault some idiots ignored all the warnings and got themselves killed. I'd very much like to avoid a fight with them because that's a distraction from my studies.
gpt
So you might be off the hook if your little lair there is considered sovereign territory. You might also be able to brush them off by inviting an international investigation from authorities native to the country those teenagers were from; in a jurisdictional dispute, the League tends to butt out almost immediately. 

Depending on what continuity you are watch out because they may send their covert operations group of edgy teenagers to probe you discretely. In that case just try to keep your nose clean for awhile.