Daemonic Incursion
The 666th chapter only step on the battlefield when a daemonic threat is effective. These rule changes are designed to make your The Terminus Decree games more narrative, presenting the CHAOS DAEMONS - the threat Grey Knights were designed to oppose. However you can stick to normal Acolyte rules.
INCURSION LEVEL
Select Mark Of Chaos, daemons of which can incurse the killzone in scenarios. If you select 
CHAOS UNDIVIDED, that means all 4 of them. In the Campaign, whenever it is required to set up CHAOS DAEMONS operatives in the killzone, set up operatives with the selected mark.
Write up and track the Incursion Level throughout your campaign, initial Incursion Level is 1. When the Incursion Level reaches 0, you win the Campaign. When the Incursion Level reaches 20, the planet is done - you lose the Campaign.
To track the changes in Incursion Level, consult the following table:
| Condition | Incursion Level change |
| Scenario ends | +1 |
| Friendly non-GREY KNIGHT operatives have used PSYCHIC weapons or abilities during the scenario. | +1 |
| Investigation Roll is performed, and the result is other, than 2, 7 or 10. | +1 |
| Each item of Rare Equipment gained from looting objects in the killzone. | +1 |
| CHAOS DAEMONS LEADER operative survived the scenario. | +1 |
| CHAOS DAEMONS HERALD operative survived the scenario. | +2 |
| All CHAOS DAEMONS HERALD operatives in the killzone were incapacitated | -1 |
| Any other CHAOS DAEMON operatives, that were in the killzone, survived the scenario. | +1 |
| All CHAOS DAEMON operatives in the killzone (if there were any) incapacitated | -1 |
| All friendly operatives were incapacitated during the scenario. | +1 |
| All friendly FOLLOWER and AUXILIA operatives, that were set up in the killzone while there were any CHAOS DAEMON operatives, were incapacitated. | -1 to a minimum of 1 |
| Any friendly FOLLOWER or AUXILIA operative survived the scenario in whicn there were any CHAOS DAEMONS operatives. | +1 |
| Any clues were found in the killzone. | Game Master decides |
| A GREATER DAEMON operative was incapacitated. | -2 |
INVESTIGATION TABLE
Replace Investigation Table rolls as follows:
| D10 | Effect |
| 2 | Protective Studies: If current Incursion Level is 2 to 5, decrease it by 1. If current Incursion Level is 6 or more, decrease it by 2 instead. |
| 7 | Noctilith Artifacts: Upcoming Scenario won't increase the Incursion Level. |
| 10 | True Name Uncovered: Increase the Incursion Level to 12, but if players incpacitate all the GREATER DAEMON operatives in the upcoming scenario, -12 Incursion Level (instead of -2). |
THREAT AND RESPONSE
The following table is balanced for 2-3 players, upscale or downscale it if required.
Whenever enemy operatives are set up in the killzone, follow the alterations from the table below:
| Incursion Level | Threat | Response |
| 1-3 | Resolve as usual | None required |
| 4-5 | In the upcoming scenario, replace D3 enemy operatives with CHAOS DAEMONS. | Players can take additional 2EP of equipment |
| 6-7 | In the upcoming scenario, add 3 CHAOS DAEMONS operatives. | Add 1 to scenario DV per player |
| 8-9 | In the upcoming scenario, add 6 CHAOS DAEMONS operatives, one of which is HERALD. | Add 2 to scenario DV per player |
| 10+ | The option above, plus for each Enemy Reinforcements event, set up 3 additional CHAOS DAEMONS operatives. | The option above, and players can take additional 2EP of equipment |
| 12+ | The option above, plus add a GREATER DAEMON operative for each 2 levels above 10. | The option above, and Terminator Armour is available for GREY KNIGHT operatives. |