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Mindstrike forces a perils on a psyker it hits, ghosthelm saves from perils on a 3+; rerollable with fortune.

I read the other day that ghosthelm only prevents you from taking perils after you cast a spell; but that doesn't appear to be what it says in the Eldar book. The wording on Ghosthelm seems very specific, that it is a 3+ save against perils; and since fortune allows rerolls on saves; Uthwe and his boys all have 3+ rerollable saves on perils.

Is this really how its supposed to work?

It's not a save, it's a chance to negate outside of normal saves (like FNP). It's just 3+, no rerolls, but it applies to all perils.

So its a 3+ save vs perils, but shouldn't be allowed rerolls from Fortune?

I'd have to read the relevant paragraph, but I don't have an Eldar codex here with me.

Its not a save, just like FnP.

You don't get to reroll it from Fortune.

As quark and Grey Tempalr have stated, it's not a save. Perils of the Warp is negated on a roll of X.