Can you cast multiple signature spells per turn?

No books nearby but vampire counts magic users can all cast invocation of nehek once each.

What @crazy_Dokta says.

BRB p. 31: "Note that bonuses and penalties from Hex, Augment and other spells are cumulative, but normally cannot take any characteristics above 10 or below 1."

Be aware that this does not include identical special rules, which do not stack - unless specifically stated otherwise, of course.

Yes

Correct.

Also correct.

What @crazy_Dokta says.

BRB p. 37 "Remember that, unless specified otherwise, each Wizard can cast each spell only once per turn" [Italics mine]

BRB p. 490: "After choosing replacements for duplicate spells, a Wizard can always choose to substitute one of the spells he rolls with the signature spell of a lore — even if another Wizard in the same army already knows the signature spell." 

And as quoted before:


Since all your Wizards are allowed to have the signature spell, each of them is allowed to cast it once per turn, and the effects will be cumulative, although they cannot take any characteristics above 10 or below 1 - unless specifically stated otherwise. Casting Wyssan's Wildform multiple times on the same unit will have a cumulative effect, but since it does not state otherwise, it will not take any characteristic above 10. Note that this factors in all other sources of bonuses, with the exception of random characteristics. 

There is no such ruling. The BRB specifically states that the effects of Hexes and Augments and other spells stack. The Erratum regarding special rules was needed to clarify that the same special rule does not stack (as I pointed out), but that different special rules (with the same effect) will stack - unless, of course, specifically stated otherwise.

BRB p. 66 (original): "Unless otherwise noted, the effects of multiple special rules are cumulative."

BRB p. 66 (updated): "Unless otherwise noted, the effects of different special rules are cumulative. However, unless otherwise stated, a model gains no additional benefit from having the same special rule multiple times.”

Hehe, to tag me to use a K instead of a Q 😍
DiscoQing

And for Crazy_D use: crazydokta758
Crazy_Dokta

This is because of the tapatalk (app) and the forum names are different. In one place you use K and in one place Q.

One of those weird interactions between integration of multiple platforms.

Not sure you can @ in the webpage but you can reply to posts and that will notify the author. I the app you can @ the tapatalk name.