Please check my account. I synt wing. in the link "ссылка;
Synt. wing D + wing D + new feather (90%) = feather
It is not wing C. Why?
Sorry, my's english very very bad

it is my picture
"ссылка;

You used the same wings D grade?

No, wings D + another wings D + new feather (90%).
You not say same wings D. How can i konw?

In the recipe synthesis in the news it was clearly stated that you need to use the wings of one species. Write to technical support support@ninjawars2.ru describe the problem and maybe you will be reimbursed for your loss