Six stratagems, and the two most characteristic ones are mirrors of each other.
Sustained by Agony (1 CP) fires just after an Emperor's Children unit destroys an enemy unit: a friendly Legions of Excess unit within 6 inches has one model recover up to 3 lost wounds, or if it is a Daemonettes unit, return up to D3+3 destroyed models instead. The legion half heals the daemon half.
Ecstatic Slaughter (1 CP) fires just after a Legions of Excess unit destroys an enemy unit: a friendly unengaged Emperor's Children unit within 6 inches can declare a charge. The daemon half creates a charge for the legion half. Note the limitation, that a unit which has already fought this phase cannot fight again.
Both require the 6 inch proximity the detachment rule already wants, so they reward the same positioning discipline rather than a different one.
Sycophantic Surge (1 CP) is how the daemons borrow the army rule they do not have: the targeted Legions of Excess unit is eligible to declare a charge in a turn it Advanced or Fell Back, provided at least one target is within Engagement Range of an Emperor's Children unit. That last clause again pulls the halves together.
Violent Crescendo (2 CP) gives a Slaanesh Beasts, Infantry or Mounted unit 6 inch Pile-in and Consolidation moves, and relaxes the requirement to end closer to the closest enemy model. Uncanny Reactions (1 CP) subtracts 1 from hit rolls against a targeted SLAANESH unit, and the wide keyword means it covers either half.
Dark Apparitions (2 CP) removes an unengaged Daemonettes unit to Strategic Reserves, and if it returns by Deep Strike next turn it can be set up more than 6 inches horizontally from enemies rather than the usual distance, provided it lands wholly within 8 inches of a friendly Emperor's Children unit. This stratagem's Effect section is one of the two entries Faction Pack v1.2 amends by name for this detachment, changing 9 inches to 8 inches.