Should this informal series of "I beat the game now here's a drawing of the true final boss defeated" pictures be a pool or a parent/child relation? The pool would allow being made in order of defeat rather than in order of upload to Danbooru, but this is also an informal pool (and the artist has other collections like it that aren't all uploaded to Danbooru, like their annual drawing of Sirica from the Kirby anime or their semi-annual drawing of Galeem).