Step 1: Farm the weakest monster in each region for resources. Skip battles with everyone else unless required to progress through the game.
Weakest monsters are:
- Forest = Green Twink Orc
- Dustridge = Green Orc
- Valley = Yellow Wolf
- Beach = Liam (battling him levels his affinity, so use caution)
- Whiterain = Yellow Orc (battling him levels his affinity, so use caution)
- Feasterra = Green Daddy Orc
- Golden Sand = Red Twink Orc
- Lavalanch = Red Wolf
- Solitude = (Nobody)
About Liam: Liam is farmed for Meat needed to craft Food, so you'll be battling him a lot. Fortunately, he takes a while to level his affinity, I didn't even reach 50% Affinity by the time I beat the King.
Getting Food: Craft food at Valdo's Cooking Pot until you get to the second highest dish, Stuffed Bull Testicles. I completed the game using this dish, which is much easier to obtain than the Orc's Favourite Dish.
Extra Note: Getting the "Came Over" screen doesn't prevent you from unlocking the secret ending, so don't worry if you lose a battle, just try again. :)