Tower

A Tower is a specific magical creature that is infamous, and extremely dangerous.

Overview
Towers are an extremely rare magical creature, known only by a collection of facts about them, as research into them is spotty at best. They are most well known for their immortality, and their exclusive diet of Prince/Princess blood, to the point that they can only barely keep up a glamour without drooling in their presence. They abduct Princes/Princesses and steal them away, exsanguinating their prey up to almost the point of death, and repeat the process over the course of their lifespan until the Prince/Princess dies a horrifyingly painful death, at which point they go looking for a new Prince/Princess to feast upon in a ritual that is intended to last one hundred years.

Towers are infamous for their extreme danger, other magical creatures are either outright afraid of or aggressive towards them, though it's clear all but the most powerful of creatures could cause them any harm, and their confirmed appearance in the city is cause for alarm for practically any Prince or Princess under the care of a major magical creature. The RCPD has lost whole divisions of their workforce from such creatures, and are best avoided at all costs.

Known Towers
Kyne: A Tower the Prince Division interacts with at the Travelling Fair. Is the Bodyguard target of Jaer'iko.

Trivia

 * According to most who know of them, there has only ever been one Tower.
 * The ancient story concept of a Princess locked away in a tower comes from this creature.