Talk:Seven Deadly Sins Series/@comment-4188031-20131211215757/@comment-6192846-20131211223529

Sometime before the Venomania Event since she is the one who gives the sword to Cherubim. She loses it sometime after the Conchita incident. Irina seems to freely get her vessels back from Prim too so its more like a borrow and share relationship imo. Key vanishes from the monastery around the time Abyss I.R. is defeated at the coast. Gumillia doesn't get the Venom Sword and Irina does not get it, as far as we know.

Your answer to how they get to Gallerian and Ma is partially answered by each sin's bio. The Venom Sword somehow came into the Octo family's possession and the Spoon Corruption Case's name implies the Marlon Spoon was involved. Somehow, Elluka ended up losing all the vessels at some point.