How do i restrict ritual to terrain?

[Sombre]

It's probably a new bitmask in the #spec field. lch or DrPraetorious should be able to tell you what it is, if it is indeed usable.

Meanwhile, just make a copy of the vila/sand/whatever spell and make changes to it. You can't change the #spec attributes though, of course.

[mehrunes_dagon]

so, to restrict ritual to forest, i need some to copy some forest-only ritual

And which ritual is forest-only? Or forest-mountain only?