The Tavern

As the title. I'm a dith worshipper who has the ring of umbra in a shop. Would its umbra effects stack with Dith's one?

Stealth bonus is calculated as max of one given by piety and one from the ring.
https://github.com/crawl/crawl/blob/mas ... r.cc#L3235
I guess the same happens to range (max is used) but I cannot find it.

Slight hijack: Do you know how range affects the umbra? Do you only get the boosts against monsters that are in the Umbra? Or do you keep one-or-both based on you being in the umbra?