Ok, was thinking about what powers you get a 2+ inv save from - in the codex it says "The Daemon has a 2+ inv save against all wounds caused by psychic powers and force weapons". So a standard way of reading this would be to say that wounds caused by say Bolt of Change, or Avenger. However, I think that RaW opens up some interesting ideas;
Doom/Guide
10 guided Dire Avengers blade storm 40 shots at your doomed flesh hounds, hitting thirty times, and then another 7 with guide, and wounding 16 times, and then again 10 times with doom. The 7 guide hits are caused by a psychic power, and the the 10 doom wounds are caused by a psychic power. Would you argue for a 2+ inv save?
Null Zone
4 Devastors fire lascannons at your Bloodthirster, hitting three times, wounding three times. You save two of these. Would you argue that you get a 2+ save for the reroll against the other wound? Possibly you'll have to reroll the passed 2+ again?
Warp Time
Any hits or wounds that are rerolled by the CSM player are caused by psychic powers.
Lash (A real stretch of the rules)
If a lash is used on a unit to clump them together, or brought out of cover, if that unit is then hit by a blast template or enemy fire, those wounds are indirectly caused by a psychic power.
Basically any power that causes you to take a wound by RaW would allow you to take a 2+ save.
Now I'm not saying I'd do this in a friendly game, but I might in a tournement, espcially if my opponent showed a proclivaty to rules lawyering.
Discuss.
Doom/Guide
10 guided Dire Avengers blade storm 40 shots at your doomed flesh hounds, hitting thirty times, and then another 7 with guide, and wounding 16 times, and then again 10 times with doom. The 7 guide hits are caused by a psychic power, and the the 10 doom wounds are caused by a psychic power. Would you argue for a 2+ inv save?
Null Zone
4 Devastors fire lascannons at your Bloodthirster, hitting three times, wounding three times. You save two of these. Would you argue that you get a 2+ save for the reroll against the other wound? Possibly you'll have to reroll the passed 2+ again?
Warp Time
Any hits or wounds that are rerolled by the CSM player are caused by psychic powers.
Lash (A real stretch of the rules)
If a lash is used on a unit to clump them together, or brought out of cover, if that unit is then hit by a blast template or enemy fire, those wounds are indirectly caused by a psychic power.
Basically any power that causes you to take a wound by RaW would allow you to take a 2+ save.
Now I'm not saying I'd do this in a friendly game, but I might in a tournement, espcially if my opponent showed a proclivaty to rules lawyering.
Discuss.