Codex Specific Rules

Astra Militarum
Any Orders given to a unit will also apply to friendly models within 6".

Chaos Daemons
The Warp Storm rule is not used in TIG.

Dark Eldar
All friendly models from a Dark Eldar Army that have Power from Pain immediately count as having earned one Pain Token for every 5 non-vehicle enemies they have killed.

Imperial Knights
This Codex is by default Banned.

Khorne Daemonkin
The Blood Tithe rule is disabled.

Militarum Tempestus
Any orders given to a unit will also apply to friendly models within 6"

Tau
When a model uses a Markerlight, it's effect will apply to all friendly models within 6"