This will be updated as more monsters appear in the fic. I have to think of prizes that are high but not way too high, and it takes a bit of math. I've been doing calculus just to reach the conclusion that with these prizes as the parting point, I'll be able to balance future drops.
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Goblin: ·Magic Stone - 250 Vallis ·Goblin Fang - 400 Vallis
Kobold: ·Magic Stone - 300 Vallis ·Kobold Nail - 500 Vallis
Jack Bird: ·Magic Stone - 50 Vallis ·Jack Bird's Golden Egg - 1.000.000 Vallis
Killer Ant: ·Magic Stone - 375 Vallis ·Ant Jaw - 590 Vallis