Special Detachment: 4 HQ, 6 troops, 3 Elite, fast and Heavy; Dark Apostles can be taken for every other HQ slot and do not take up an FOC slot; All units that can take a mark must. Also, before each movement phase, roll on this table for each unit with a mark:

D6............Result
1......................Nothing
2......................Grants Mark of Khorne; units that already have mark of khorne are granted Ranpage
3......................Grants Mark of Nurgle; units that already have Mark of Nurgle gain +1W and IWND
4......................Grants Mark of Slaanesh; Units that already have mark of Slaanesh gain Fleet and Move Through Cover
5......................Grants Mark of Tzeench; units that already have Mark of Tzeench gain Preferred Enemy on one enemy unit chosen after rolling and improve their invulreble save by one point

Chaos Black Altar

The Black Altars have rarely seen the battlefield in recent years. Once a common sight amongst Traitor Legions, in particular the Word Bearers, such relics of bygone days have either been lost to the ravages of time, or sealed within the deepest vaults of monasteries dedicated to the Ruinous Powers. Such items however are still encountered occasionally, mounted atop a converted Land Raider chassis, accompanied by a high-ranking Dark Apostle, whos purpose is to instill fear amongst his enemies and to bolster the morale of his subordinates.

However, there are times when not even the darkest relics contained within the Altar can stir the Ruinous Powers' attentions, at which point the Apostle is forced to offer a blood sacrifice. The internal hold of the Land Raider is used as a holding cell for those "chosen" for such a task. Within the once-proud war machine, groups of human and sometimes even xenos species huddle in masses, most against their will, waiting for the moment when the Apostle's assistants will pluck them from the hold and spill their blood upon the black slate of the unholy Altar.

0-1 Black Altar: 350 Points
Tank, Open Topped (Unique)
BS4
Armour: F14 S14 R14
HP4

Transport Capacity: 1 Dark Apostle included in the base points value + 20 Cultists (not included). The Dark Apostle is armed with the standard loadout and may not be upgraded further. Note that due to the nature of the artefact, only Cultists and the Dark Apostle can embark upon the vehicle.

Weapons
2 Sponson Twin-Linked Lascannons
Dark Altar of Chaos

Special Rules
Assault Vehicle
Daemonic Possession

Black Altar of Chaos: The altar allows the Dark Apostle to use one of the following spells each turn. Such spells are counted as Psychic Attacks, but do not require a Psychic Test, and are not subject to the Deny the Witch rule. Note that the vehicle is not counted as a Psychic Pilot, and therefore will not be affected by weapons which specifically target Psykers.

- Blessings of the Unholy: This is a blessing with a range of 12". Pick a single friendly model within range. The selected model must take a Toughness test, taking a S4 Ap2 hit if failing. Regardless of wherever he passes or fails the test, the model may then immediatly roll on the Chaos Boon table, re-rolling Spawnhood and Dark Apotheosis results.

- Horrific Incantation: This is a witchfire power with the following profile, and does not affect the number of weapons the vehicle may fire.
Range: 36" S- Ap3 Heavy 1, Large Blast
The strength of the shot is equal to D3 + the current turn number. Eg a shot fired on Turn 3 will have a Strength value of 3+D3. Treat values higher than 10 as Destroyer

- Runious Enlightenment: This is a blessing with a range of 6". Choose a single friendly model within range. The chosen unit may re-roll any rolls of 1 until the end of the player turn.

- Spectral Anomalies: This is a nova power with the following profile
Range 12" S5 Ap- Heavy D6, Rending

Sacrificial Altar: You may choose to sacrifice members from a unit of Cultists embarked upon the Dark Altar to boost the Dark Altar's power. After choosing the Altar's power for that turn you may remove Cultists from the unit to change the power's effects by the following manner:

- Blessing of the Unholy - Costs D6 Cultists: The selected model may re-roll the Toughness test if failed.
- Horrific Incantation - Costs D6 Cultists: The Strengh value is D6 + Turn number rather than D3
- Ruinous Enlightenment - Costs 2D6 Cultists: The range of the power is increased by 6"
- Spectral Anomalies - Costs D6 Cultists: The power inflicts 2D6 hits rather than D6.

Note that models sacrificed in this manner do not generate any form of victory point for the enemy, nor will this effect cause them to take a Morale Check. Also note that the Cultists sacrificed can be from any unit currently embarked, not necessarily one which began the game embarked upon the Altar.

So imagine a Land Raider. Remove the top of the hull and place the Apostle and the Altar at the back near the engines. The rest of the insides are just a holding cell for Cultists waiting to be sacrificed.