In the Perils of the Warp table under the point Rending the Veil it says:

The air vibrates with images of cackling Daemons and the kaleidoscopic fabric of the Warp is rendered visible to mortal eyes. All sentient creatures within 1d100 metres must test against Fear (2). The psyker must test against Fear (4) instead. This effect lasts for 1d5 rounds.

Does this mean you have to roll against Fear every turn for 1d5 turns?

The 40k games have always been ambiguous in terms of how often you need to test for Fear. The rulebook doesn't address this at all, from what I can tell. I'd personally rule that once you pass you're good until circumstances change (new Fear-causing thing introduced, e.g.).

That's what I've always ruled, you roll until you pass then you're good until something new comes up.

That's what I've always ruled, you roll until you pass then you're good until something new comes up.

So if you fail your roll, you roll again next turn?

Yeah.

Wow, that has the potential to be really bad . I will handle it like that if it comes up.

Thanks for the answers.

"Sanity is for the weak"

I think in this case, applying a Fear test regardless of the results is appropriate. The +expletive deleted+ warp is happening all around you. Like that boat ride in Willy Wonka, the older movie, where he goes all crazy and a chicken gets it's head cut. =D

We handled it that way:

One source of Fear requires one roll (If the very same creature appears several times we still test only one for it and maybe increase the fear rating in steps to represent their numbers) unless, as the Doctor said, things change.

If you succeed you are golden.

If not you have enough trouble with actually snapping out of what ever the Result of your failure was.

Otherwise I cant imagine it being practical for the fear tests sum up with the willpower tests that are a result of the other fear tests to snap out in quite a roll orgy.