Split Again
(Rule)Description: if a friendly unit of Blue Horrors suffers any casualties, the slain Horrors will split and create Brimstone Horrors at the end of that phase (after all other units have performed their actions and made their attacks). One model is created for each slain Blue Horror - if there is already a friendly Brimstone Horror unit within 6" of the Blue Horrors, add the newly created Brimstone Horrors to that unit, otherwise set them up as a new unit within 6" of the unit of Blue Horrors. If a rule causes a whole unit of Blue Horrors to be removed at once (excluding Daemonic Instabilities), you can immediately create a unit of Brimstone Horrors just before removing the last model from the Blue Horrors unit. The unit of Brimstone Horrors has one model for each model in the unit of Blue Horrors at the point as which it was removed, and must be set up with all models within 6" of the last model from the Blue Horrors unit.