The gnoll geomancer is the source of all the earth-moving magic in the upcoming gnoll variant of Shattered Pixel Dungeon’s caves quest. You’ll find the geomancer taking a literal dirt nap initially, but expect to deal with a lot of moving earth once you’ve gotten its attention!
We’re still a ways out from a beta for the next update, but there should hopefully be a blog post in about a week.
None of the other quests vary their rewards based on the content like this, and doing something like that might make people choose to ignore the quest if the rewards don’t match their build.