Lucemon, leader of the fallen digimon, has enough administrator rights left that he can sense Yggdrasill opening the way to the real world. He will be having none of that. A Digi-Destined child is not a weapon he can allow Yggdrassil to wield against him.
He can’t stop Yggdrasill… but he can redirect where the connection happens. This…this might actually help. Yes…the expenditure of his power would be ruinous, but it is either gamble on this plot or have his forces slowly die of attrition, if the royal knights do not kill them all first.
Lucemon flies from his tower in the Dark Area, towards the coast, and sinks into the Deep Ocean. He is risking the attention of Dagomon, but he needs to be closer to where the connection passes through, and the Deep Ocean connects to all networks once you go deep enough.
There, he can sense the network connection. Lucemon does not have complete access to the network, not like Yggdrasill does. Unlike Yggdrasill he cannot find a specific useful human by reading through their social media (Lucemon in fact lost full admin privileges before social media even existed), but he can certainly use the admin rights he has left to redirect the connection to a certain place. A place with no children, so Yggdrasill cannot brainwash the the human who comes through so easily, one where the the humans would be educated, one where the humans would be sworn to save lives, even ‘evil’ ones.
Changing where the connection was made drains Lucemon, more than he expected it to, the cold waters of the Deep Ocean sapping his data as his full attention is on changing the connection, weakening him. This has to be done, this could a complete gamechanger if it works right, and would likely deny Yggdrasill a major weapon even if it goes wrong. He ignores his code being corrupted as he pushes the connection to the right place in the real world.
Hours (or maybe years, time is more malleable in the Deep Ocean) pass. Much of Lucemons data has drained into the cold and grasping waters, but he thinks he finally has it set correctly. All this power and data being used has to have attracted Dagomon by now, and even Lucemon fears him, despite the gap in evolution stages between them. Lucemon has been left even weaker than he expected from spending so long in the Deep Ocean, he needs to leave now.
He swims for the surface.
The water gets colder, darker, greener, more dense. Dagomon has found him. Lucemon looks behind him and sees the red eyes and tentacles of Dagomon coming up towards him. Lucemon can feel his data being stripped away even more quickly as Dagomon exerts his power over the waters of the Deep Ocean. He pushes himself faster upwards, and the more he pushes the more the water resists him. But the longer he stays the more of his data will be leeched from him. The tentacles of Dagomon seem to be all around him. Lucemon pushes upwards hard enough that it strains his digital core, his outer code in tatters around him, parts of his body showing only wireframe as the data has been leeched from him.
Finally, he surfaces. There is a dark laugh from under the water as Dagomon retreats, having already gotten much of Lucemons data. Lucemon barely makes it to shore before he collapses. He is so damaged he can no longer maintain consciousness.
His digital core cannot regenerate all the data his body is missing. To save itself, it reverts Lucemon back to an earlier, smaller form. He devolves.