Fated Mutation

Use this Stratagem in the Fight phase, when a THOUSAND SONS CHAOS SPAWN unit
from your army is selected to fight. Until the end
of the phase, instead of rolling for that unit's
Mutated Beyond Reason ability, you can select the result. Until the end of the phase, each time you determine the number of Attacks a model in that
unit can make, add 1 to the result.