Curate, connect, and discover
Gregor still hungover from raging (idk if he actually does that but something similar just sounds like a cool headcanon to me), when a random kid comes up to him and asks him if he's the child of his dead bond:
Suddenly overcome with the need for a Gregor the overlander and Percy Jackson crossover that takes place post hero of olympus and post the underland chronicles yes I could be the change I want to see in the world but that would require me nailing down this nebulous cloud of "WHAT IF???" All I got so far is some demigod seeing Gregor in his rager mode and asking if he's a child of ares and then my brain starts screaming ahhhhhhhhhhhhh