WARNING: This article contains MAJOR SPOILERS relating to
some of the most pivotal parts of Worm. Although all articles may contain spoilers, this article will reveal major plot twists and should almost certainly be avoided unless you have finished the story.
As Eden and Zion approached earth, Abaddon asked to exchange information with Eden. Following their exchange of shards, Eden became distracted and crashed into several earths.
Doctor Mother mentions that the shards Eden obtained during the exchange (referred to as a "foreign element" in Arc 29) tended to yield powers without standard restrictions when administered to Cauldron subjects.
↑The third entity travels more through momentum than by insinuation. It expends vast quantities of power to change course. - Excerpt from Interlude 29
↑“There is a foreign agent in them. The entity altered each power he granted to give them certain restrictions. No power would be able to truly affect him, no power would cross the boundaries he set in dimension, or in affecting other powers. There are no alterations to the elements in these, only to the accompanying abilities, or complimentary powers. The powers granted from these vials don’t cause the recipients to forget the visions they see. Eidolon was one such case. The extreme deviant cases on the special containment floor make up much of the remainder.” - Excerpt from Venom 29.7
↑It looked at the female, and it saw a shard that wasn’t its own, but wasn’t dead. - Excerpt from Interlude 26
↑They can alter the shards they put out there, before the shards hae mature, because a connection is maintained. No connection = 'dead' shard. - Wildbow on Spacebattles