[Glorantha] Trying to remember a trollish spell

[tim at timellis.demon.co.uk]

 Jane says
> I'm pretty sure that long, long ago, I saw a writeup
> for a troll cult that included a spell for effectively
> grabbing the attention of everyone in the vicinity.
> All attack spells had to be aimed at the caster, all
> missiles went their way, and so on. (I assume it was
> backed up by heavy armour and a lot of hit points).
> Can anyone remind me what cult this might have been,
> and where I saw it?

I think Xiola Umbar and the Original (RQ2) Trollpack