While a Bodyguard unit contains a Leader, it is known as an Attached unit and, with the exception of rules that are triggered when units are destroyed (pg 12), it is treated as a single unit for all rules purposes. Each time an attack targets an Attached unit, until the attacking unit has resolved all of its attacks, you must use the Toughness characteristic of the Bodyguard models in that unit, even if a Leader in that unit has a different Toughness characteristic. Each time an attack successfully wounds an Attached unit, that attack cannot be allocated to a Character model in that unit, even if that Character model has lost one or more wounds or has already had attacks allocated to it this phase. As soon as the last Bodyguard model in an Attached unit has been destroyed, any attacks made against that unit that have yet to be allocated can then be allocated to Character models in that unit.

Each time the last model in a Bodyguard unit is destroyed, each CHARACTER unit that is part of that Attached unit becomes a separate unit, with its original Starting Strength. If this happens as the result of an attack, they become separate units after the attacking unit has resolved all of its attacks. 

Each time the last model in a CHARACTER unit that is attached to a Bodyguard unit is destroyed and there is not another CHARACTER unit attached, that Attached unit’s Bodyguard unit becomes a separate unit, with its original Starting Strength. If this happens as the result of an attack, they become separate units after the attacking unit has resolved all of its attacks. 

Each time a unit that is part of an Attached unit is destroyed, it does not have the keywords of any other units that make up that Attached unit (unless it has those keywords on its own datasheet) for the purposes of any rules that would be triggered when that unit is destroyed.

Profiles:

Abilities
Leader: This model can be attached to the following unit: RUBRIC MARINES
Flames of Change (Psychic): While this model is leading a unit, ranged weapons equipped by models in that unit have the [IGNORES COVER] ability.
Altered Reality (Psychic): Once per battle round, after a Hit roll, a Wound roll or a saving throw is made for this model, you can change the result of that roll to a 6.
Mortal Sorcery (Aura): While a friendly Scintillating Legions Psyker unit from your army is within 6" of and visible to this unit, that Scintillating Legions unit has the Cabal of Sorcerers ability.

Unit	M	T	SV	W	LD	OC
Sorcerer on Disc of Tzeentch [Legends]	12"	4	3+	5	6+	1

Modifiers:

append name (Battle-hardened)

and

16+ selections of Experience Points in self (recursive)

30- selections of Experience Points in self (recursive)

append name (Battle-ready)

and

5- selections of Experience Points in self (recursive)

1+ forces of Crusade Force in roster (recursive)

append name (Blooded)

and

6+ selections of Experience Points in self (recursive)

15- selections of Experience Points in self (recursive)

append name (Heroic)

and

31+ selections of Experience Points in self (recursive)

50- selections of Experience Points in self (recursive)

append name (Legendary)

51+ selections of Experience Points in self (recursive)

increment max Crusade: Weapon Modifications(self) 2

repeat for every 1 selections of Weapon Modifications in self (recursive)

increment min Crusade: Weapon Modifications(self) 2

repeat for every 1 selections of Weapon Modifications in self (recursive)

set hidden true

0 selections of Show Legends in roster (recursive)

Used By (1)

Chaos - Thousand Sons(Catalogue)