This spell can affect a single infantry unit within 24" and line of sight of the caster. If successfully cast, the spell turns 4D6 of the targeted unit's models into Clanrats. If the number rolled is equal to or greater than the number of models in the targeted unit, remove the enemy models and replace them with Clanrats with any normally allowed equipment or command. The casting player now controls this unit. If the casting player does not have enough models to replace the entire unit, transfigure what you can, the rest are considered destroyed. If the number rolled is not great enough to replace the whole targeted unit, then remove as casualties the number rolled - they simply mutate and die, or were slain by horrified comrades. No saves of any kind are allowed against the twisting power of the Horned Rat.