Let's make a list of combinations that could lead to a new item.
The Stony Ruin equivalent of
Beast Fangs should be Stinger Barbs &
Stubby Carrots should be Fresh Apples.
As the carrot + fang combination results in a Minor ATK
the other test combination
Fresh Apple + Fresh Apple + Stinger Barb should have resulted in a Major ATK Potion. It failed into Ash though.
Starting with my tries:
There's no Gold Slab in the game, I suppose.
Thereby combination
Gold Nugget + Gold Nugget + Gold Nugget
Results in Ash.
Combining all three ashes results in Ash as well.
Let's make a list of combinations that could lead to a new item.