"Princess Twilight!"
"Starlight, how often must I remind you not to call me Princess? We are equals. And what causes you to disturb me now? You don't usually enter here - or anywhere with this level of haste."
"You've got to read this. It appeared at your last teleport origin."
A Report on the Negative Effects of Teleportation on Teleporters
Dear Princess Twilight,
If you teleport ever again, you will die. There is nothing anypony can do to prevent this.
Now that I have your attention:
Abstract
This is the last will and testament of the Twilight Council of Twilight's Intermediary Sphere. It details the consequences of teleportation. Chief among those consequences is that teleportation causes a copy of the teleporter to be created and arrive at the origin; the original of the teleporter is simply left in a spherical space of indeterminate construction embedded within the astral plane.
Every time you've teleported, you've condemned a copy of yourself to death. There is now no more room for copies. If you teleport again, you will not materialise anywhere.
The enclosed 300 pages are the abstract of this report. Use your Tome Expansion spell to access the 12500-page executive summary. Use it again to access the 205000-page full report.
And please ban teleportation. It's not just you. Any teleport by any living being does this.
Twilight Sparkle, Acting Chair of the Twilight Council
et al.
Both ruling princesses were silent for a very long time.
"Starlight, please tell Sharp Quill to clear my schedule."