The Empire is full of a huge number of disparate people with only a vague sense of unity. The place is full of Gods, spirits, and entities that all demand worship. Beyond the scope of the nine "accepted" Gods, there exists an entire spectrum of minor Gods, some of which hearken to a bygone era, some of which are new, and a few are relatively new to the collective worship of locals. Most of the minor Gods can be summed up as either local deities specific to a particular town, burg, or province, or deities tied to rivers, forests, and other natural places. The difference between the two often depends on whom you ask.
Localised deities are just that—deities whose influence or reputation are rarely found beyond a few tens of miles, although some are recognised over greater distances. This is typical for certain types of deities associated with roads or trails, with small shrines scattered along their length. The line is often blurry between what is a true deity and what is some Venerated Soul from long ago, although the power and respect accorded is the same. The people that worship these local powers are typically extreme in their faith, and balk at the idea that they may be performing some form of heresy by their veneration, and often must fight long and hard in convincing travelling Witch Hunters that what they do is an act of devotion, rather than heresy.
Nature deities are far more common. Depending on who is asked, these deities are either minor aspects of Taal, Rhya, or Manann, some form of spirit that is mistakenly treated as a deity, or even a holdover deity whose roots lie with the Elves or Dwarfs. Nature deities are often associated with a sacred grove (or even an individual tree), cave, stream, or other place of natural beauty, might, and majesty. Others are actually nymphs, dryads, naiads, and other fey creatures mistakenly treated as if they were actual Gods. If a person believes in a particular nature deity, he's likely to leave an offering to both the God in question and also to Taal and Rhya, giving all of them honour. The rites demanded by these deities can seem ludicrous and anachronistic for the nonbeliever, but carry immense weight for those that believe in their power. For example, a local river God may demand an offering of a virginal sow, the cut hair of three maidens, and the blood of a black rooster once a year, lest it rises from its bank and flood the surrounding landscape.
Regardless of whether you're dealing with local or nature deities, outsiders may believe these demands have little weight, but for locals, performing the necessary rites and sacrifices carry great importance. It's not unheard of for a normal, unassuming citizen of the Empire to run afoul of the demands and edicts of one of these Gods, often without their knowledge, to which the locals set things straight. Thus, a stranger who visits some far-flung province may become a sacrifice to these Gods, mainly due to ignorance rather than outright intent in committing some grave offence.