Monumentum was born out of a breeding that would've never happen under normal circumstances. Ghostface 5017 found a soulmate and infinite love with Memento Mori 4915 . None of the handlers of the parents knew about it until it was too late. Glad every puppy was healthy they decided that Signum Mortis should live with his dad while Monumentum should live with his mum. As Monumentum is the second out of three, he always stays under control of his older brother. Also this is sometimes annoying, he still loves Signum and is happy to have him around in quite dangerous situations.