Board Thread:News and Announcements/@comment-5679696-20150228205454/@comment-26229833-20160315124946

I believe that Hercules killed 12 as he had 12 Labors i.e. defeating the 12 monstrous beasts. He completed his final labor by killing Cerberus, with Snow and Meg's help.

Also, how did Snow kill 5 and Emma kill 10? Boy, this makes me wonder whether she must be feeling guilty like how she did with Cora (although it could've been out of self-defense and of course not pre-meditated murder).