Four, and two of them were rewritten by name in Faction Pack v1.2, so those two are first-party.
- Incandaeum (15 pts). Rewritten by Faction Pack v1.2: EXALTED SORCERER model only. Once per battle, when selecting a Ritual for the bearer to attempt, you can select Doombolt even if a model from your army has already attempted to manifest that Ritual this phase.
This is the most mechanically interesting enhancement in the faction, because it is the only way to break the army rule's one-Ritual-per-turn cap. Normally each of the four Rituals can be attempted once per turn across your whole army, which hard-caps you at four. This lets you attempt Doombolt twice, and Doombolt is the damage Ritual: D3 mortal wounds, or D3+3 on a Psychic test result of 11 or more. Two attempts at that in one phase is a genuine spike. Note the restriction: EXALTED SORCERER model only, so you need that specific datasheet. - Umbralefic Crystal (30 pts). Rewritten by Faction Pack v1.2: THOUSAND SONS model only, once per battle per army. In your Command phase, if this unit is unengaged, place it in strategic reserves; it has Deep Strike until the start of your next Shooting phase, and it must make an ingress move in your next Movement phase, including in your first turn.
Sourcing note on enhancement points. The Munitorum Field Manual v1.3 raises this to 30 pts, and the community mirror still shows 20 pts. We publish the official figure. If you have costed a list from older community coverage, this one moved. - Lord of Forbidden Lore (20 pts). THOUSAND SONS model only. Each time the bearer manifests a Ritual, add 6 inches to its range while resolving it. This stacks usefully with the detachment rule's Imbued Manifestation turn, and on a 24-inch Ritual it is a substantial extension of what you can threaten from safety. - Eldritch Vortex of E'Taph (35 pts). The most expensive enhancement in the faction. Mirror-sourced.
(Points come from the Munitorum Field Manual v1.3 and move with updates; confirm in the app.)