The Curse Belated
Warlocks normally reserve the casting of this ritual for a ghoul who is prized above all others, or one near and dear to a thaumaturge's unbeating heart. By performing this ritual on a ghoul, the thaumaturge can all but guarantee his thrall's chance of survival, for the moment the ghoul dies, the vampiric blood inside his body courses through his system and thereafter resurrects him ans a full-fledged vampire. The thaumaturge brands the ghoul with his sigil, which vanishes once the ghoul becomes one of the undead.
System: The thaumaturge, as part of the requirement of the ritual, will temporarily lose one permanent point form his blood pool. this is invested, instead, in the ghoul he wishes to safeguard. A second point of the thaumaturge's blood must be fed to the ghoul, which remains in the ghoul's body until he dies (the ghoul may not use it to power Disciplines, heal, etc.). Upon death, the inaccessible point of vitae will save the ghoul from Final Death, and bring him back as a vampire of the same clan as the caster, usually after a short delay to allow the ghoul's killers to depart. The temporary blood pool point returns to the thaumaturge after the ghoul becomes Kindred.
Addendum: This ritual can be cast by a thaumaturge for another vampire provided the would be sire provides both points of blood. "The Magister 21:57, 15 September 2018 (MDT)"