Undead Fortitude. If damage reduces the Remembrancer to 0 hit points, it must make a Constitution saving throw with a DC of 5 + the damage taken, unless the damage is radiant or from a critical hit. On a success, the Remembrancer drops to 1 hit point instead.     Nag'Hwil Mind. The Remembrancer is immune to any effect which would control its actions, such as Charm Monster or a cleric's Turn Undead ability (though Destroy Undead could affect them). This immunity is only overcome by the Gestalt Will special ability of a Remembrancer Congregation.   Congregate. If more than three Remembrancers are within 120ft. of each other, they will attempt to use all their movement to meet at the nearest possible point to each other. Once at least four Remembrancers have met at a single space, they immediately form a Remembrancer Congregation, which takes the highest initiative count of the individuals which formed it.