The nigh-unstoppable inevitables serve a singular purpose: they enforce contracts forged in the Hall of Concordance in the city of Sigil. Primus, the leader of the modrons, created maruts and other inevitables to bring order to dealings between planar folk. Many creatures, including yugoloths, will enter into a contract with inevitables if asked. Instinct: Enforce its contract

• Slam them against something else
• Bring them to the Hall of Concordance
• Ignore an attack to enforce the contract
• Hunt them down, no matter where they go