Priest level outside combat also strongly affects preaching and sacrificing. So besides re-animation, preaching, sacrificing, and searching for holy sites, priest level doesn't affect anything outside combat .
That's a nice idea about the crystal shield though, especially for a bless nation that normally only gets H2 priests.
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Whether he submitted the post, or whether he did not, made no difference. The Thought Police would get him just the same. He had committed— would still have committed, even if he had never set pen to paper— the essential crime that contained all others in itself. Thoughtcrime, they called it. Thoughtcrime was not a thing that could be concealed forever. http://z7.invisionfree.com/Dom3mods/index.php?
Oh, yeah, Communion Master works too IIRC. This is nice for nations like Marverni that have priests (Druids) with Astral. Marverni doesn't really benefit from a bless but Fanaticism is always nice; 4 communion slaves will boost a Druid to H4. For nations that don't have this you can use a Crystal Matrix to do the same thing. However, a Crystal Shield is really less hassle if you don't need H4 spells.
-Max
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Bauchelain - "Qwik Ben iz uzin wallhax! HAX!"
Quick Ben - "lol pwned"
["Memories of Ice", by Steven Erikson. Retranslated into l33t.]