Inevitable

Inevitables were lawful intelligent constructs native to the Clockwork Nirvana of Mechanus and the plane of Dweomerheart, where they were created by and served Mystra in her role of guardian of magic.

History
Primus, the One and the Prime, was also known for creating inevitables with the purpose of establishing order in the dealings between inhabitants of the planes.

Activities
They sought out and punished those who broke fundamental laws, such as "Bargains should be kept", "The guilty should be punished", or "Everyone dies eventually". Each type of inevitable would target specific infringements, but all would act without emotion, punishing those found guilty to the word of the law.