MarvinPA wrote:The regular pantheon of gods all tolerate each other, hence all of their altars being together in the same temple and so on. Lugonu has been banished and is the only one who actively hates all the other gods and really wants to mess with the status quo. (dpeg can give a much more detailed/flavourful explanation I'm sure but that's the gist of it).
dpeg can ... and cannot resist doing so
The replies in this thread are spot on. Nethack-style altar sacrifices are not fun (you can easily witness this in Nethack itself -- the method is called "altar camping"). Tactical effects of altars like certain players/monsters incurring boosts or penalties at the altar or it's neighbourhood will lead to bad gameplay: think of teleportation trap luring, only in worse. Perhaps something in this direction could be done, but it'd need proper thought and would probably have to be quite subtle.
Using altars for divine purpose exists in Crawl, and it has a very restricted application: one-off abilities. I think this is actually okay: it will occur so rarely that it is not tedious, and there is a slight gameplay tangent (you cannot do this anytime, although this does not matter too much with the current one-off powers).
Now on to Lugonu: Marvin already said that there is a kind of mutual agreement among the temple gods which seems to bridge even antagonistic gods like Trog and Sif Muna (refer to your favourite polytheistic religion to probably find something similar). However, [as I see it] Lugonu is something like the fallen god -- presumably banished to the Abyss by the other gods after an attempt to usurp the pantheon. This is why Lugonu followers are supposed to spread out (from the Abyss) and sow corruption. It would be extremely flavourful if part of Lugonu's piety came from desecrating (i.e. destroying) other gods' altars. The only thing holding us back at this is the current wrath mechanic: obviously, no god will like having the places of worship being demolished, and such an action will incur wrath. However, that wrath should build up slowly. This concept is not just for theme, it is also about gameplay: a future Lugonu worshiper would have to think about which altars to desecrate; in other words, altars would be a (finite) resource.