Centaurs - Arachne Solara as nature deity

I was looking at the Gloranthan bestiary and it mentions that centaurs worship Arachne Solara in her role of nature deity. I was curious what  form this worship took and what the benefits were to Centaurs. Arachne Solara isn't even mentioned in the RQG rulebook and there's no short form cult. now we may well get something in the upcoming cults book but previous gloranthan publications have always treated Arachne Solara as a rather unknowable, enigmatic sort of deity.

Which led me to wonder what practical form does the centaur worship take and what practical benefits do they get from it in terms of spirit magic, rune magic and so on ?