Shade
Monster Junkie
Since you requested some wordsmithing, here goes...
Communal Reliance (Su): Great distances may sever a member's ties to the communal consciousness of the horde. A horde entity that strays more than 100 miles from the farthest other member of its horde is stricken as per a feeblemind spell. Should the straying entity return within range, the feeblemind effect is immediately removed. An entity that remains out of contact for more than 24 hours will perish 1d10 days thereafter (no save). Since all horde entities are in constant communication with each other and are aware of this weakness, this will generally only occur if a horde entity is forcibly moved.
Communal Reliance (Su): Great distances may sever a member's ties to the communal consciousness of the horde. A horde entity that strays more than 100 miles from the farthest other member of its horde is stricken as per a feeblemind spell. Should the straying entity return within range, the feeblemind effect is immediately removed. An entity that remains out of contact for more than 24 hours will perish 1d10 days thereafter (no save). Since all horde entities are in constant communication with each other and are aware of this weakness, this will generally only occur if a horde entity is forcibly moved.