Not everyone is as clear cut as they claim to be, as you'll find out in this quest.
The Witcher 3: Funeral Pyres
On the road just west of Mulbrydale you'll find a Priest of Eternal Fire. Approach him and he'll ask you to set fire to three bodies on a battlefield.
All three bodies are scattered around Mulbrydale within walking distance and it's not much effort to find them and set them alight using Igni. Just be careful of roaming wild dogs and ghouls.
You'll get 9 EXP for each of the three fires, but at the third pit you'll discover that the Priest you're working for isn't very honourable.
Once all three fires are lit, head back to the Priest at the bridge. You can decide to either take the bribe or tell the Priest to go F himself and fight him and his men. Either way, you walk away with 200 crowns, which isn't to be sniffed at.