Sentimonster

 is a creature responsible for protecting the people who invoke it. They are created by Mayura using power of the Peacock Miraculous, the while Ladybug and Cat Noir have to eliminate them.

Description
Sentimonster are made thanks to Mayura feathers, which he can transform into Amok with his special skill. They can take any form and are fully devoted to the person who created them.

Creation
After Mayura sends one of the feathers from the Hand Fan that has been saturated with negative energy and transformed into Amok to the person of her choice, she can use her skills to create a helper for the super hero or super villain. They are completely obedient to their creator and seem to have no will of their own. Sentimonstre disappears when the item infected with the feather is destroyed. Just as Hawk Moth cleans his Akumas, Mayura can destroy Sentimonstre himself when he fulfills his task and cleanse the previously infected feather.

Amokized sentimonsters
In order to defeat a sentimonster without the Peacock Miraculous, the object where the feather is housed must be broken and then Ladybug must purify the amok in the same way she purifies akumas.

Trivia

 * The name sentimonster is a portmanteau of "sentiment", a synonym for feelings, and "monster", hinting towards the fact that sentimonsters are created by emotions.
 * This power is somewhat similar to Akumatization, as both involve infecting an item with magic and communicating telepathically with a person.
 * Unlike Akumatization, however, Amokization can infect an object that's been destroyed, although it is still possible to damage it further to release the Amok.